A bathroom lock device includes an inner lock assembly, an outer actuating wheel and a latch unit. The inner lock assembly is consisted of an actuating press rod, an unlocking cam and an inner actuating wheel, which constitutes a press-button mechanism. In locking operation, the actuating press rod is pressed to limit rotation of the outer actuating wheel and to rest in lock stage. In unlocking operation, an inner lever is operated to successively actuate the unlocking cam and the inner actuating wheel for rotation. Thus, the preceding rotation of the unlocking cam can push the actuating press rod to rest in unlock stage, and the following rotation of the inner actuating wheel can drive the latch unit for retraction.