A terminal box that can be reliably fixed to a solar cell module is provided. The terminal box includes a bottom wall facing a back surface of the solar cell module, a top wall facing the bottom wall, side walls, and a housing space defined by the bottom wall, the top wall and the side walls to accommodate a component to be mounted. The bottom wall includes a limiting wall formed in a periphery of the bottom wall to project toward the solar cell module, and a communication opening for allowing a charging space defined by the limiting wall and the bottom wall to communicate with the housing space. The limiting wall defines a gap for allowing the charging space to communicate with external space of the limiting wall.