To provide a connection/branch box for connecting or branching cable protection members for accommodating cables having wires or piping paths in the vertical direction along the paths.

The connection/branch box B1 for connecting or branching troughs (the cable protection members) T1, T2 for internally accommodating and protecting the cables K, comprises a rectangular box body 10 having a square opening 11 on one face, and a lid 20 for occluding the opening 11 by an occluding plate 21 and attached to the box body 10. The box body 10 is provided with a first link opening C1 linked to the trough T1 horizontally disposed on one of four peripheral wall plates 12. The occluding plate 21 of the lid 20 is provided with a second link opening C2 linked to the other trough T2 vertically disposed at an eccentric location from the center 23 of the occluding plate 21.