A connector includes a connector body coupled to the toy gun to be connected with an upper portion of the magazine; a hole formed to pass through front end of the connector body and configured to accommodate a projectile provided by the magazine; a projectile fixing portion positioned on the connector body in which the hole is formed and configured to fix the projectile provided via the hole; a projectile sensing portion which senses whether or not a projectile remains in the hole, a position of the projectile sensing portion being changed depending on whether or not a projectile remains in the hole; and a first protrusion interlocked with the projectile sensing portion, the first protrusion moving forward or backward to control a stopper depending on whether or not a projectile remains in the hole, the stopper allowing or blocking movement of a cylinder of the toy gun.