Provided is a power generation device using magnetic force, the power generation device comprising: a plurality of tunnel-type bodies having unilateral open passages and arranged and fixed at the same intervals on a revolutional orbit, wherein the respective tunnel-type bodies are provided with a plurality of permanent magnets between inner magnetic bodies and outer magnetic bodies, and permanent magnets and the outer magnetic bodies are attached to the outer surface of the inner magnetic bodies such that the permanent magnets facing the inner and outer magnetic bodies can have opposite polarities, thereby forming magnetic fields in inner body spaces; and magnetic border membranes having opposite magnetic poles on the inner and outer sides thereof and formed on entrance sides and exit sides of the tunnel-type bodies.