Abstract: A lock structure comprises an upper shell and a lower shell. A traverse through hole is formed between the assembled upper and lower shells. A coin insertion slot and a key plate insertion slot are oppositely formed on the upper shell. A stopping mechanism is pivotally mounted inside the upper shell. A restoring mechanism is mounted below the stopping mechanism. The restoring mechanism and the stopping mechanism can be driven and shifted by each other. Two swing arms are oppositely, pivotally mounted on the stopping mechanism. Two recessed edges are formed on the swing arms. Two hooks are mounted on the swing arms, respectively. A spring is coupled with the swing arms for forming front and rear clipping openings so as to clip a coin or a key plate. The restoring mechanism is composed of a second spring and two push plates. The push plates are coupled with another spring.