diff --git a/gen/gen_avx512.cpp b/gen/gen_avx512.cpp
index 0379e2a..6f3ea78 100644
--- a/gen/gen_avx512.cpp
+++ b/gen/gen_avx512.cpp
@@ -653,6 +653,9 @@
 		{ 0x54, "vpopcntw", T_66 | T_0F38 | T_YMM | T_MUST_EVEX | T_EW1 | T_SAE_Z, false },
 		{ 0x55, "vpopcntd", T_66 | T_0F38 | T_YMM | T_MUST_EVEX | T_EW0 | T_SAE_Z | T_B32, false },
 		{ 0x55, "vpopcntq", T_66 | T_0F38 | T_YMM | T_MUST_EVEX | T_EW1 | T_SAE_Z | T_B64, false },
+
+		{ 0x62, "vpexpandb", T_66 | T_0F38 | T_YMM | T_MUST_EVEX | T_EW0 | T_SAE_Z | T_N1, false },
+		{ 0x62, "vpexpandw", T_66 | T_0F38 | T_YMM | T_MUST_EVEX | T_EW1 | T_SAE_Z | T_N2, false },
 	};
 	for (size_t i = 0; i < NUM_OF_ARRAY(tbl); i++) {
 		const Tbl *p = &tbl[i];
diff --git a/test/misc.cpp b/test/misc.cpp
index afa3cfd..231ff32 100644
--- a/test/misc.cpp
+++ b/test/misc.cpp
@@ -522,4 +522,43 @@
 	CYBOZU_TEST_EQUAL(c.getSize(), n);
 	CYBOZU_TEST_EQUAL_ARRAY(c.getCode(), tbl, n);
 }
+CYBOZU_TEST_AUTO(vexpand)
+{
+	struct Code : Xbyak::CodeGenerator {
+		Code()
+		{
+			vpexpandb(xmm5|k3|T_z, xmm30);
+			vpexpandb(ymm5|k3|T_z, ymm30);
+			vpexpandb(zmm5|k3|T_z, zmm30);
+			vpexpandb(xmm5|k3|T_z, ptr [rax + 0x40]);
+			vpexpandb(ymm5|k3|T_z, ptr [rax + 0x40]);
+			vpexpandb(zmm5|k3|T_z, ptr [rax + 0x40]);
+
+			vpexpandw(xmm5|k3|T_z, xmm30);
+			vpexpandw(ymm5|k3|T_z, ymm30);
+			vpexpandw(zmm5|k3|T_z, zmm30);
+			vpexpandw(xmm5|k3|T_z, ptr [rax + 0x40]);
+			vpexpandw(ymm5|k3|T_z, ptr [rax + 0x40]);
+			vpexpandw(zmm5|k3|T_z, ptr [rax + 0x40]);
+		}
+	} c;
+	const uint8_t tbl[] = {
+		0x62, 0x92, 0x7d, 0x8b, 0x62, 0xee,
+		0x62, 0x92, 0x7d, 0xab, 0x62, 0xee,
+		0x62, 0x92, 0x7d, 0xcb, 0x62, 0xee,
+		0x62, 0xf2, 0x7d, 0x8b, 0x62, 0x68, 0x40,
+		0x62, 0xf2, 0x7d, 0xab, 0x62, 0x68, 0x40,
+		0x62, 0xf2, 0x7d, 0xcb, 0x62, 0x68, 0x40,
+
+		0x62, 0x92, 0xfd, 0x8b, 0x62, 0xee,
+		0x62, 0x92, 0xfd, 0xab, 0x62, 0xee,
+		0x62, 0x92, 0xfd, 0xcb, 0x62, 0xee,
+		0x62, 0xf2, 0xfd, 0x8b, 0x62, 0x68, 0x20,
+		0x62, 0xf2, 0xfd, 0xab, 0x62, 0x68, 0x20,
+		0x62, 0xf2, 0xfd, 0xcb, 0x62, 0x68, 0x20,
+	};
+	const size_t n = sizeof(tbl) / sizeof(tbl[0]);
+	CYBOZU_TEST_EQUAL(c.getSize(), n);
+	CYBOZU_TEST_EQUAL_ARRAY(c.getCode(), tbl, n);
+}
 #endif
diff --git a/xbyak/xbyak_mnemonic.h b/xbyak/xbyak_mnemonic.h
index 5ccd7a1..b3c9398 100644
--- a/xbyak/xbyak_mnemonic.h
+++ b/xbyak/xbyak_mnemonic.h
@@ -1805,8 +1805,10 @@
 void vpermt2q(const Xmm& x1, const Xmm& x2, const Operand& op) { opAVX_X_X_XM(x1, x2, op, T_66 | T_0F38 | T_EW1 | T_YMM | T_MUST_EVEX | T_B64, 0x7E); }
 void vpermt2w(const Xmm& x1, const Xmm& x2, const Operand& op) { opAVX_X_X_XM(x1, x2, op, T_66 | T_0F38 | T_EW1 | T_YMM | T_MUST_EVEX, 0x7D); }
 void vpermw(const Xmm& x1, const Xmm& x2, const Operand& op) { opAVX_X_X_XM(x1, x2, op, T_66 | T_0F38 | T_EW1 | T_YMM | T_MUST_EVEX, 0x8D); }
+void vpexpandb(const Xmm& x, const Operand& op) { opAVX_X_XM_IMM(x, op, T_N1 | T_66 | T_0F38 | T_EW0 | T_YMM | T_SAE_Z | T_MUST_EVEX, 0x62); }
 void vpexpandd(const Xmm& x, const Operand& op) { opAVX_X_XM_IMM(x, op, T_N4 | T_66 | T_0F38 | T_EW0 | T_YMM | T_MUST_EVEX, 0x89); }
 void vpexpandq(const Xmm& x, const Operand& op) { opAVX_X_XM_IMM(x, op, T_N8 | T_66 | T_0F38 | T_EW1 | T_YMM | T_MUST_EVEX, 0x89); }
+void vpexpandw(const Xmm& x, const Operand& op) { opAVX_X_XM_IMM(x, op, T_N2 | T_66 | T_0F38 | T_EW1 | T_YMM | T_SAE_Z | T_MUST_EVEX, 0x62); }
 void vpgatherdd(const Xmm& x, const Address& addr) { opGather2(x, addr, T_N4 | T_66 | T_0F38 | T_EW0 | T_YMM | T_MUST_EVEX, 0x90, 0); }
 void vpgatherdq(const Xmm& x, const Address& addr) { opGather2(x, addr, T_N8 | T_66 | T_0F38 | T_EW1 | T_YMM | T_MUST_EVEX, 0x90, 1); }
 void vpgatherqd(const Xmm& x, const Address& addr) { opGather2(x, addr, T_N4 | T_66 | T_0F38 | T_EW0 | T_YMM | T_MUST_EVEX, 0x91, 2); }