To provide the connecting structure for a partition in which a support member for a connection is not required when the partitions are mutually crossed at a right angle and connected.

One partition P1 has a sideward recessed groove 5 in the upper end face, and a flute section 15 having a bottom wall 16 in the partition is formed along the height direction of the partition P1 in a section in the vicinity of a right or left side end section or an intermediate section in the cross direction of one surface of the partition P1 while a connecting section is formed by projecting and forming an engaging piece 17c from one surface of the partition in a connecting member 17 being formed to the bottom wall 16 of the groove section 15 and having the engaging piece 17c on the front end side. Then, the other partition P2 has an end face groove with an engaging section 18 engaged with the engaging piece 17c in an end face on one side of the partition P2 while a section to be connected is formed by shaping a recessed section 8b or 41b, in which a pressing member 20 in which a front end section is engaged with sideways recessed grooves 5 or 6 in the upper end face of one partition is secured, to an upper end face in the vicinity of one side of the partition P2.