To obtain a reinforced concrete pile excellent in workability and heat exchange efficiency and having heat exchange function for attaining cost reduction.

A spiral small-diameter steel pipe 3 having function as a hoop reinforcement is arranged around a main reinforcement 1 in a full length or a partial section of the pile, and function of carrying out underground heat exchange by passing a heating-medium through the spiral small-diameter steel pipe 3 is added. The spiral small-diameter steel pipe 3 carries out both functions of the hoop reinforcement and a capillary for heat exchange, so that cost is reduced. The spiral small-diameter steel pipe 3 is made of a steel material as a reinforcement bar and has section property which is equal to or higher than the hoop reinforcement even when arranged in a pile body. Accordingly weak points as a reinforced concrete structure are not caused.