diff --git a/include/picrin/port.h b/include/picrin/port.h
new file mode 100644
index 00000000..6ae638f2
--- /dev/null
+++ b/include/picrin/port.h
@@ -0,0 +1,27 @@
+#ifndef PORT_H__
+#define PORT_H__
+
+#include "picrin.h"
+
+enum pic_port_flag {
+  PIC_PORT_IN,
+  PIC_PORT_OUT,
+  PIC_PORT_TEXT,
+  PIC_PORT_BINARY
+};
+
+enum pic_port_status {
+  PIC_PORT_OPEN,
+  PIC_PORT_CLOSE,
+};
+
+struct pic_port {
+  PIC_OBJECT_HEADER
+  FILE *file;
+  short flags;
+  char status;
+};
+
+#define pic_port_ptr(v) ((struct pic_port_t *)v.u.data)
+
+#endif
diff --git a/include/picrin/value.h b/include/picrin/value.h
index 743e04dd..c6ade674 100644
--- a/include/picrin/value.h
+++ b/include/picrin/value.h
@@ -27,7 +27,8 @@ enum pic_tt {
   /* heap */
   PIC_TT_PAIR,
   PIC_TT_SYMBOL,
-  PIC_TT_PROC
+  PIC_TT_PROC,
+  PIC_TT_PORT
 };
 
 #define PIC_OBJECT_HEADER			\
@@ -49,6 +50,7 @@ struct pic_symbol {
 };
 
 struct pic_proc;
+struct pic_port;
 
 #define pic_obj_ptr(o) ((struct pic_object *)o.u.data)
 #define pic_pair_ptr(o) ((struct pic_pair *)o.u.data)
diff --git a/src/port.c b/src/port.c
index f4e5de2b..db278eb5 100644
--- a/src/port.c
+++ b/src/port.c
@@ -3,6 +3,7 @@
 
 #include "picrin.h"
 #include "picrin/proc.h"
+#include "picrin/port.h"
 
 static void write_pair(pic_state *pic, struct pic_pair *pair);
 
@@ -36,6 +37,9 @@ write(pic_state *pic, pic_value obj)
   case PIC_TT_PROC:
     printf("#<proc %p>", pic_proc_ptr(obj));
     break;
+  case PIC_TT_PORT:
+    printf("#<port %p>", pic_port_ptr(obj));
+    break;
   }
 }