An object of the present invention is to provide an electrical terminal box capable of improving the workability of wiring operations. The electrical junction box comprises a frame including: a storage section for storing electronic components; and a passage part (5), in which wires are drawn from an accommodating portion, the cross-sectional shape of the passage portion is a U-shaped shape in which the dimension in the depth direction (D) is larger than the dimension in the width direction, a distal end portion (5a) of the passage portion has an engaging portion (60) for engaging with a widening member that widens the passage portion in the width direction, and the engaging portion comprises a guide portion (61) that protrudes from the side wall portion (51) of the passage portion and extends in the depth direction in order to guide the widening member in the depth direction.