A unit module compartment structure includes: a first unit module compartment, including a first partition board having connection means at one end, and a second partition board having connection means at two ends thereof, respectively, the connection means of the first partition board and the connection means at one end of the second partition board being connected so as to form a first angle less than 90°； and a second unit module compartment, including a third partition board having connection means at one end, and a fourth partition board having connection means at two ends thereof, respectively, wherein the connection means at one end of the third partition board, the connection means at one end of the fourth partition board and the connection means at another end of the second partition board are connected so as to form a second angle identical with the first angle.
