A camera (10) that includes: a sensor module (1) which measures radiation data; heat radiation parts (14-1, 14-2) which radiate heat generated as the sensor module (1) is cooled; an electrical apparatus (20); and fans (15-1, 15-2) which generate a flow of a first fluid for cooling the heat radiation parts (14-1, 14-2). The camera further has a first passage (41) through which the first fluid flows, a second passage (43) through which a second fluid for cooling the electrical apparatus (20) flows, and a merging part (44) which suctions the second fluid from the second passage (43) into the first passage (41) by means of the flow of the first fluid. Such a camera (10) can be made more compact than other cameras which further include a fan for circulating the second fluid through the second passage (43).