diff --git a/java/src/main/java/org/msgpack/annotation/Ignore.java b/java/src/main/java/org/msgpack/annotation/Ignore.java
index dfe9f7ed..96a37bb6 100644
--- a/java/src/main/java/org/msgpack/annotation/Ignore.java
+++ b/java/src/main/java/org/msgpack/annotation/Ignore.java
@@ -22,7 +22,7 @@ import java.lang.annotation.Retention;
 import java.lang.annotation.RetentionPolicy;
 import java.lang.annotation.Target;
 
-@Target(ElementType.FIELD)
+@Target({ElementType.FIELD, ElementType.PARAMETER})
 @Retention(RetentionPolicy.RUNTIME)
 public @interface Ignore {
 }
diff --git a/java/src/main/java/org/msgpack/annotation/Index.java b/java/src/main/java/org/msgpack/annotation/Index.java
index b5670120..7c1b6598 100644
--- a/java/src/main/java/org/msgpack/annotation/Index.java
+++ b/java/src/main/java/org/msgpack/annotation/Index.java
@@ -22,7 +22,7 @@ import java.lang.annotation.Retention;
 import java.lang.annotation.RetentionPolicy;
 import java.lang.annotation.Target;
 
-@Target(ElementType.FIELD)
+@Target({ElementType.FIELD, ElementType.PARAMETER})
 @Retention(RetentionPolicy.RUNTIME)
 public @interface Index {
 	int value();
diff --git a/java/src/main/java/org/msgpack/annotation/Nullable.java b/java/src/main/java/org/msgpack/annotation/Nullable.java
index 7a6f05fa..e6893e72 100644
--- a/java/src/main/java/org/msgpack/annotation/Nullable.java
+++ b/java/src/main/java/org/msgpack/annotation/Nullable.java
@@ -22,7 +22,7 @@ import java.lang.annotation.Retention;
 import java.lang.annotation.RetentionPolicy;
 import java.lang.annotation.Target;
 
-@Target(ElementType.FIELD)
+@Target({ElementType.FIELD, ElementType.PARAMETER})
 @Retention(RetentionPolicy.RUNTIME)
 public @interface Nullable {
 }
diff --git a/java/src/main/java/org/msgpack/annotation/Optional.java b/java/src/main/java/org/msgpack/annotation/Optional.java
index 383ba959..7894f881 100644
--- a/java/src/main/java/org/msgpack/annotation/Optional.java
+++ b/java/src/main/java/org/msgpack/annotation/Optional.java
@@ -22,7 +22,7 @@ import java.lang.annotation.Retention;
 import java.lang.annotation.RetentionPolicy;
 import java.lang.annotation.Target;
 
-@Target(ElementType.FIELD)
+@Target({ElementType.FIELD, ElementType.PARAMETER})
 @Retention(RetentionPolicy.RUNTIME)
 public @interface Optional {
 }
diff --git a/java/src/main/java/org/msgpack/annotation/Required.java b/java/src/main/java/org/msgpack/annotation/Required.java
index 00d4ecbe..16311085 100644
--- a/java/src/main/java/org/msgpack/annotation/Required.java
+++ b/java/src/main/java/org/msgpack/annotation/Required.java
@@ -22,7 +22,7 @@ import java.lang.annotation.Retention;
 import java.lang.annotation.RetentionPolicy;
 import java.lang.annotation.Target;
 
-@Target(ElementType.FIELD)
+@Target({ElementType.FIELD, ElementType.PARAMETER})
 @Retention(RetentionPolicy.RUNTIME)
 public @interface Required {
 }