A heater module (22L, 22R) of the present invention is provided along a heated surface (13CLa) of an object to be heated (13CL, 13CR). The heater module includes: a plate-like heater body (34) that faces the heated surface of the object to be heated; an L-shaped member (31) including a module main surface (31m) to which the plate-like heater body is provided, and a bent arm portion (31c) bent with respect to the module main surface; and a power source connection terminal (35) provided in the bent arm portion and connected to the plate-like heater body.