A dismountable structure comprising at least one structural part (10) having a female socket provided with at least one transversely extending first hole (11) and at least one structural part (20) having a male socket (23) provided with at least one transversely extending second hole (24). The sockets are so sized and shaped that each male socket is receivable in each female socket in a locking position in which at least one second hole is aligned with at least one first hole. The structure includes fastening means (30,34) having at feast one resiliently displaceable locking element (33,33A) for interlocking one female socket and one male socket, when they are in the locking positions, by at least one locking element extending from inside the male socket through the aligned holes of the two sockets.