PHOTOMETRIC DEVICE

A photometric device (1) comprises: a polygonal columnar or polygonal frustum-shaped light-guide member (2) having a light-incident-side end surface (2a) and a light-emitting-side end surface (2b) arepolygonal; a target optical system (3); and a light-receiving unit (5). The target optical system (3) forms an image of a light source being measured (LS) on the light-incident-side end surface (2a)of the light-guide member (2). Light from the light source being measured (LS) enters the light-guide member (2) via the target optical system (3), exits from the light-emitting-side end surface (2a)of the light-guide member (2), and is received by the light-receiving unit (5). The light-receiving unit (5) has a plurality of sensors (51) with different characteristics, and is disposed immediatelyafter the light-emitting-side end surface (2b) of the light-guide member (2), or a relay optical system (4) is disposed between the light-receiving unit (5) and the light-emitting-side end surface (2b) of the light-guide member