PROBLEM TO BE SOLVED: To achieve light flux measurement capable of simply measuring light distribution property, without using an integration sphere.MEANS FOR SOLVING THE PROBLEM: A light flux measurement device comprises: a main body part 10 which is jointed to a jig 60, has a hemisphere face 12 which is recess in a hemispherical state on a joint surface with the jig 60, and arranges a measurement object WK held to a holding plane 62 of the jig 60 on a center of a sphere formed by the hemisphere face 12; and light reception means 30 which are respectively arranged in proximate to plural opening holes 14a, 14b, 14c opened to positions forming a predetermined inclination angle θ with an axial line passing the centers of the sphere and of the hemisphere face 12, on a first arc on the hemisphere face 12 of the main body part 10, which crosses a first cut face which passes the center of the sphere formed by the hemisphere face 12 and orthogonal to the holding plane 62, and receiving light emission of the measurement object WK detected by the opening holes 14a, 14b, 14c, in which an opening area of each of the respective opening holes 14a, 14b, 14c is set to have a size corresponding to a sphere band coefficient at the inclination angle θ.SELECTED DRAWING: Figure 1
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