To provide an economical, highly rigid and strong steel sheet pile.

A steel sheet pile constituting rolled member has a fitting joint 2 at its end in the width direction in a cross section. The steel sheet pile constituting rolled member comprises a lower flange 3 connected to the fitting joint 2, a lower web 24 continuously arranged to be bent so that it may integrally protrude from the other end of the lower flange 3, a middle flange 25 continuously and integrally arranged to be bent from the other end of the lower web, and an upper web 26 continuously arranged to be bent in a manner of protruding from the other end of the middle flange. Two steel sheet piles constituting rolled members which are symmetric, except for the fitting joints 2, with respect to a line being a contact surface of the upper webs 26 are symmetrically arranged back to back so that the upper webs 26 are in contact with each other with the fitting joints positioned on both ends in the width direction. The upper webs 26 are joined to each other by a joint means of welding, bolts or drill screws.