The present invention provides a photopolymerization device which allows a space irradiated with a light to have a high temperature while inhibiting a temperature rise of a light source used for the space. The photopolymerization device comprises: a housing; a polymerization space which is surrounded by a wall in the housing and in which polymerization is carried out; a light-emitting diode light source which irradiates a light for polymerization into the polymerization space; and a temperature control device which heats inside the polymerization space, wherein the light-emitting diode light source is arranged outside the polymerization space.