Herein described is a photovoltaic module (30) that comprises a rectangular
module body (61) and a frame (60) secured to the sides of the body. The
frame is composed of an upper bar (63), a lower bar (64) and a pair of
side bars (65 and 66). The upper bar (63) has an insertion projection (71)
projecting from a part which is middle in thickness direction of the upper
bar. The projection (71) is thinner than the upper bar (63).
