To provide a fixing fitting for a movable partition of a constant temperature container capable of stably and positively carrying out fixing (locking) and releasing (unlocking) of the partition even when an internal wall is thermally deformed due to a temperature difference between an exterior and an interior.

The fixing fitting 1 for fixing the partition 22 moving in the constant temperature container and partitioning an internal space, to a rail 27 for fixing fixed to an inner wall (the internal wall) of a side panel 26 is composed by including a slider 6 engaged and disengaged with respect to an engagement hole 27a formed on the rail 27 for fixing, and a turnover mechanism (an energizing means) energizing the slider 6 in at least a direction (an arrowhead a direction) engaging it with the engagement hole 27a. In a fixed state of the partition 22, the slider 6 is passed through the engagement hole 27a, an its end face is abutted on the inner wall (a bottom of the engagement hole 27a) of the side panel 26.