A secondary battery module is provided to pressurize unit cells uniformly by forming the middle part thicker than the edges of a barrier and to stably support an electrode group placed in the middle of the unit cell. The secondary battery module comprises: many unit cells to be stacked; and a barrier(40) which is installed between the unit cells and of which the middle part is formed thicker than the edges. The barrier(40) gets thinner from the middle part to the edges. The barrier(40) includes a plate member(42) and protrusions(41) formed on the plate member(42). The barrier(40) is processed into a crowning structure.
