An optical position detection device includes a light receiving section receiving detection light reflected from a target object located in a detectable space through which detection light is radially emitted along an XY plane. The light receiving section includes a light receiving element and a concave mirror. A first cross section (XY cross section) of the reflective surface of the concave mirror is an arc, and a second cross section (YZ cross section) perpendicular to the first cross section is a quadratic curve. Therefore, in the in-plane direction of the XY plane, even light incident from an oblique direction with respect to the light receiving section is reflected by the concave mirror to the light receiving element. In the in-plane direction of the YZ plane, however, the range where the light reaches the light receiving element is limited via the concave mirror.