Goggles include a frame, a lens and a pair of left and right belt arms. On the frame a first stop hole is provided each left and right of a middle of each of an upper frame and a lower frame of the frame. The lens has an upper side and a lower side each of which is provided with a second stop hole at a position corresponding to each first stop hole in the frame. Each of the pair of left and right belt arms has bifurcated portions, and each end of the bifurcated portions is provided with a lock mechanism. The frame and the lens are placed on each other and the respective first and second stop holes are aligned. By the mechanisms of the belt arms, the first and second stop holes are brought into either a lock state to secure the frame, the lens and the pair of left and right belt arms, or an unlock state where the lock state is released to separate them.