An infrared light receiving device includes: a structure having a supporting base and a laminate body, the laminate body including a first superlattice layer, a second superlattice layer and a semiconductor region, the first superlattice layer, the second superlattice layer and the semiconductor region being arranged sequentially on the supporting base, and the laminate body having an array of semiconductor mesas for photodiodes and a recess defining the array of semiconductor mesas; and a first electrode connected to the first superlattice layer. The first superlattice layer has an n-type conductivity. The semiconductor region has a p-type conductivity. The first superlattice layer has a type-II superlattice structure and forming a heterojunction with the supporting base. The recess has first and second recess portions. The second recess portion has a bottom in the first superlattice layer. The first recess portion has a depth larger than that of the second recess portion.