To provide a connector configured to prevent a hook from being accidentally opened by some chance and disconnected even in the connector which is closed when in use.

The connector includes a hook member 13, a biasing member 24, a slide bar 25, a guide groove 23 and a grip 26. When the slide bar 25 comes in contact with a front end 11a of the hook 11, stepped grooves 61 and 62 where the grip 26 freely enters and exits are formed in a position so as to face each other on right/left of the guide groove 23. The grip 26 entering in the groove 61 prevents the slide bar 25 from axially moving.