A projection-type imaging device 1000 includes: a light source optical system 121 for emitting source light 122; image display elements 7a 7c each having a display surface 127 on which a plurality of micromirrors 301 are placed and driving the plurality of micromirrors 301 according to a control signal representing a prescribed image so as to reflect the source light 122 incident on the display surface 127 toward a first direction and a second direction differing from the first direction so as to obtain first light 10b and second light 10a, respectively; a prism 6 for transmitting the first light 10b and the second light 10a; a projection optical system 8 for projecting the first light 10b transmitted by the prism; an absorption section 19 for absorbing the second light 10b transmitted by the prism 6; and cooling sections 22, 23 and 24 for cooling the absorption section 19 by a liquid refrigerant 20. The first light 10b carries information on the prescribed image, the liquid refrigerant 20 is optically coupled to the prism 6, and the second light 10a reaches the absorption section 19 via the liquid refrigerant 20.