An optically coupled device and an optical module including the optically coupled device are provided that can appropriately and efficiently perform position measurement of an optical surface, and allow a product having superior overall efficiency to be stably manufactured at a low cost.An optically coupled device main body 15 is formed having a shape that allows both first lens surface 5 and second lens surface 8 to be viewed simultaneously from a surface normal direction of at least one of a first surface portion 2a and a second surface portion 3a.