Fastening tool and fastening device

A fastening tool for mounting a plate-shaped photovoltaic module on a mounting target object, the fastening tool comprising:

• a support member on which the photovoltaic module is mounted, and which is arranged on the mounting target object;
• a pressing member including a base portion and a regulating portion, the base portion being fastened to the mounting target object by a fastening member via the support member, and the regulating portion being provided on the base portion and configured to regulate movement of the photovoltaic module in a direction away from the mounting target object;
• and
• a deformation portion provided between the base portion and the mounting target object in a posture of being tilted with respect to the base portion, the deformation portion being pressed and deformed by the base portion upon fastening of the base portion to the mounting target object by the fastening member and configured to bring the regulating portion to a posture for regulating the movement of the photovoltaic module in the direction away from the mounting target object.