To provide a sleeper which can use a relatively inexpensive material which can be easily manufactured, and can secure necessary performance.

This sleeper 1 comprises: an extruded material 20 which is molded by extrusion so that a through-hole 26 elongated in a long direction can be formed; a reinforcing material 21 which is a resin reinforced by long fibers arranged in the through-hole 26; and a member 11 to be fastened which is used for being fastened to a rail. A pair of long high-strength plates 17 and 18 arranged in a state of facing each other is formed of the extruded material 20 and the reinforcing material 21. The member 11 is arranged between the high-strength plates 17 and 18 and in a position corresponding to a rail position.