diff --git a/lib/glueby/internal/wallet.rb b/lib/glueby/internal/wallet.rb
index 66a11be8..dec78f68 100644
--- a/lib/glueby/internal/wallet.rb
+++ b/lib/glueby/internal/wallet.rb
@@ -293,6 +293,10 @@ def fill_uncolored_inputs(
         [tx, fee, current_amount, provided_utxos]
       end
 
+      def import_private_key(key, label = nil)
+        wallet_adapter.import_private_key(id, key, label)
+      end
+
       private
 
       def wallet_adapter
diff --git a/lib/glueby/internal/wallet/abstract_wallet_adapter.rb b/lib/glueby/internal/wallet/abstract_wallet_adapter.rb
index 9300e8cb..74fd15d9 100644
--- a/lib/glueby/internal/wallet/abstract_wallet_adapter.rb
+++ b/lib/glueby/internal/wallet/abstract_wallet_adapter.rb
@@ -186,6 +186,19 @@ def get_addresses(wallet_id, label = nil)
           raise NotImplementedError, "You must implement #{self.class}##{__method__}"
         end
 
+        # Import a private key to the wallet
+        #
+        # CAUTION: Wallet Adapter doesn't rescan blockchain for the imported privatekey.
+        #          So the UTXOs in processed blocks are not counted on the Glueby::BlockSyncer.
+        #
+        # @param [String] wallet_id - The private key is imported to.
+        # @param [Tapyrus::Key] key - The private key that is imported to the wallet.
+        # @param [String?] label - The label to filter the addresses.
+        # @raise [Errors::PrivateKeyAlreadyImported] If the private key already imported to the wallet.
+        def import_private_key(wallet_id, key, label = nil)
+          raise NotImplementedError, "You must implement #{self.class}##{__method__}"
+        end
+
         # Create and returns pay to contract address
         # @param [String] wallet_id - The wallet id that is offered by `create_wallet()` method.
         # @param [String] contents - The data to be used for generating pay-to-contract address
diff --git a/lib/glueby/internal/wallet/active_record_wallet_adapter.rb b/lib/glueby/internal/wallet/active_record_wallet_adapter.rb
index 7ec891a2..16d32c4f 100644
--- a/lib/glueby/internal/wallet/active_record_wallet_adapter.rb
+++ b/lib/glueby/internal/wallet/active_record_wallet_adapter.rb
@@ -143,6 +143,30 @@ def get_addresses(wallet_id, label = nil)
           keys.map(&:address)
         end
 
+        def import_private_key(wallet_id, key, label = nil)
+          raise Glueby::ArgumentError, 'key should be a Tapyrus::Key' unless key.is_a?(Tapyrus::Key)
+          raise Glueby::ArgumentError, 'label should be a String' if label && !label.is_a?(String)
+
+          wallet = AR::Wallet.find_by(wallet_id: wallet_id)
+          ar_key = AR::Key.find_by(
+            wallet: wallet,
+            private_key: key.priv_key,
+            public_key: key.pubkey
+          )
+          if ar_key
+            raise Errors::PrivateKeyAlreadyImported, "Key(pubkey: #{key.pubkey}) already imported in the wallet(#{wallet_id})"
+          else
+            AR::Key.create!(
+              wallet: wallet,
+              private_key: key.priv_key,
+              public_key: key.pubkey,
+              label: label,
+              purpose: :receive
+            )
+          end
+          nil
+        end
+
         def get_addresses_info(addresses)
           unless addresses.is_a?(Array)
             addresses = [addresses]
diff --git a/lib/glueby/internal/wallet/errors.rb b/lib/glueby/internal/wallet/errors.rb
index 70d2e048..0b13e97f 100644
--- a/lib/glueby/internal/wallet/errors.rb
+++ b/lib/glueby/internal/wallet/errors.rb
@@ -9,6 +9,7 @@ class WalletAlreadyCreated < Error; end
         class WalletNotFound < Error; end
         class InvalidSighashType < Error; end
         class InvalidSigner < Error; end
+        class PrivateKeyAlreadyImported < Error; end
       end
     end
   end
diff --git a/lib/glueby/wallet.rb b/lib/glueby/wallet.rb
index fc8f0aff..f4b2f851 100644
--- a/lib/glueby/wallet.rb
+++ b/lib/glueby/wallet.rb
@@ -35,6 +35,10 @@ def id
       @internal_wallet.id
     end
 
+    def import_private_key(key, label = nil)
+      @internal_wallet.import_private_key(key, label)
+    end
+
     # @return [HashMap] hash of balances which key is color_id or empty string, and value is amount
     def balances(only_finalized = true)
       utxos = @internal_wallet.list_unspent(only_finalized)
diff --git a/spec/glueby/internal/wallet/active_record_wallet_adapter_spec.rb b/spec/glueby/internal/wallet/active_record_wallet_adapter_spec.rb
index c9c6246a..1f0dc519 100644
--- a/spec/glueby/internal/wallet/active_record_wallet_adapter_spec.rb
+++ b/spec/glueby/internal/wallet/active_record_wallet_adapter_spec.rb
@@ -333,6 +333,65 @@
     end
   end
 
+  describe '#import_private_key' do
+    let(:key) { Tapyrus::Key.generate }
+    subject { adapter.import_private_key(wallet.wallet_id, key) }
+
+    it 'create a new Key record' do
+      expect { subject }.to change { Glueby::Internal::Wallet::AR::Key.count }.by(1)
+
+      ar_key = Glueby::Internal::Wallet::AR::Key.where(public_key: key.pubkey).first
+      expect(ar_key.private_key).to eq(key.priv_key)
+      expect(ar_key.script_pubkey).to eq(Tapyrus::Script.to_p2pkh(Tapyrus.hash160(key.pubkey)).to_hex)
+      expect(ar_key.label).to be_nil
+      expect(ar_key.purpose).to eq('receive')
+    end
+
+    context 'key is not an instance of Tapyrus::Key' do
+      let(:key) { 'invalid key' }
+
+      it 'create a new Key record' do
+        expect { subject }.to raise_error(Glueby::ArgumentError, 'key should be a Tapyrus::Key')
+      end
+    end
+
+    context 'specify label' do
+      let(:label) { 'test_label' }
+      subject { adapter.import_private_key(wallet.wallet_id, key, label) }
+
+      it 'the new Key record has label' do
+        subject
+        ar_key = Glueby::Internal::Wallet::AR::Key.where(public_key: key.pubkey).first
+        expect(ar_key.label).to eq('test_label')
+      end
+
+      context 'label is not an instance of String' do
+        let(:label) { 123 }
+        it 'create a new Key record' do
+          expect { subject }.to raise_error(Glueby::ArgumentError, 'label should be a String')
+        end
+      end
+    end
+
+    context 'the private key is already in the wallet' do
+      before do
+        Glueby::Internal::Wallet::AR::Key.create!(
+          wallet: wallet,
+          private_key: key.priv_key,
+          public_key: key.pubkey,
+          purpose: :receive
+        )
+      end
+
+      it 'create a new Key record' do
+        expect { subject }.to raise_error(
+          Glueby::Internal::Wallet::Errors::PrivateKeyAlreadyImported,
+          "Key(pubkey: #{key.pubkey}) already imported in the wallet(#{wallet.wallet_id})"
+        )
+      end
+    end
+  end
+
   describe '#get_addresses_info' do
     subject { adapter.get_addresses_info(addresses) }
 
diff --git a/spec/glueby/wallet_spec.rb b/spec/glueby/wallet_spec.rb
index d9578f9c..3105bcfb 100644
--- a/spec/glueby/wallet_spec.rb
+++ b/spec/glueby/wallet_spec.rb
@@ -75,6 +75,10 @@ def list_unspent(wallet_id, only_finalized = true, label = nil, color_id: nil)
     def token_utxos(wallet_id, color_id, only_finalized, per, page)
       []
     end
+
+    def import_private_key(wallet_id, key, label = nil)
+      true
+    end
   end
 
   before { Glueby::Internal::Wallet.wallet_adapter = TestWalletAdapter.new }
@@ -160,4 +164,13 @@ def token_utxos(wallet_id, color_id, only_finalized, per, page)
       expect(Glueby::Internal::Wallet.wallet_adapter).to have_received(:list_unspent_with_count).with("wallet_id:1", only_finalized, nil, color_id: color_id, page: 1, per: 25)
     end
   end
+
+  describe '#import_private_key' do
+    let(:key) { Tapyrus::Key.generate }
+    let(:wallet) { Glueby::Wallet.create }
+
+    it 'returns true' do
+      expect(wallet.import_private_key(key, 'test-label')).to eq(true)
+    end
+  end
 end
\ No newline at end of file