This load detection device (100) is provided with first and second beam-shaped load cells (21, 22) that are cantilevered on first and second support platforms (11b, 12b), thereby having free ends; a mount unit (30) on which a rolling element (CT) is mounted, the mount unit having a pair of wall parts (WL1, WL2) and first and second connection units (C1, C2) that are connected to the first and second beam-shaped load cells, the mount unit being provided between the first beam-shaped load cell and the second beam-shaped load cell; and regulating members (41, 42) that are detachably attached to at least one of the pair of wall parts of the mount unit, the regulating members regulating the orientation of the rolling element on the mount unit. Along the direction in which the first beam-shapedload cell extends, the free end of the second beam-shaped load cell faces the side opposite that faced by the free end of the first beam-shaped load cell, and the first and second connection units ofthe mount unit are connected to the first and second beam-shaped load cells at the free-end sides of the first and second beam-shaped load cells.