A habitat container system P1 includes at least one habitat container 5 and a holder 1 having plural container installation spaces 13 arranged vertically. The holder 1 includes a pair of front and rear frames 11 arranged via the container installation spaces 13, a lateral opening 15 opening the container installation space 13 laterally, a vertical opening 14 communicating container installation spaces 13 arranged vertically adjacent, and a pair of front and rear support portions 2 provided on opposing sides of the pair of front and rear frames 11. The habitat container 5 includes a pair of outward protrusions 65. In a state in which the habitat container 5 is accommodated in the container installation space 13, the habitat container 5 is supported by the holder 1 with the outward protrusions 65 arranged on the support portions 2.
