A toy gun comprising: a barrel extending in a longitudinal direction of a gun body; a valve body in a shape of a cylinder extending in the longitudinal direction of the gun body, forming therein an air chamber filled with compressed gas, communicating with a rear end of the barrel at a front side and having a through hole penetrating in the longitudinal direction of the gun body at a rear side; a discharge valve located inside the valve body, and provided movably between a closed position for closing communication between the barrel and the air chamber and an open position, more forward than the closed position, for opening the communication between the barrel and the air chamber; a discharge valve spring pushing the discharge valve backward and bringing the discharge valve into the closed position; a bolt located slidably in the longitudinal direction of the gun body, having an opening at a front and a closed end at a rear, having therein a hit pin for pushing the discharge valve from behind, having, on a lateral side, a cam part configured to move a bolt contact part up and down, and having a locking projection extending downward from a bottom of the rear closed end and sloping upward from front to back; a bolt spring pushing the bolt forward; a sear located below the bolt, having a projection to come into contact with the locking projection of the bolt; a first trigger bar located turnably below the sear, having the bolt contact part extending upward at or around a front end to come into contact with the cam part of the bolt, and on a lateral side, a sear locking projection for locking the sear; an inner safety located forward of the sear, having a projection to come into contact with the locking projection of the bolt;; a second trigger bar located below the inner safety and forward of the first trigger bar slidably in the longitudinal direction, having on a lateral side an inner safety locking projection for locking the inner safety; a trigger bar spring configured to bias the second trigger bar backward; and said first trigger bar further comprises a contact part configured to touch as it moves the rear of the second trigger bar. a barrel extending in a longitudinal direction of a gun body; a valve body in a shape of a cylinder extending in the longitudinal direction of the gun body, forming therein an air chamber filled with compressed gas, communicating with a rear end of the barrel at a front side and having a through hole penetrating in the longitudinal direction of the gun body at a rear side; a discharge valve located inside the valve body, and provided movably between a closed position for closing communication between the barrel and the air chamber and an open position, more forward than the closed position, for opening the communication between the barrel and the air chamber; a discharge valve spring pushing the discharge valve backward and bringing the discharge valve into the closed position; a bolt located slidably in the longitudinal direction of the gun body, having an opening at a front and a closed end at a rear, having therein a hit pin for pushing the discharge valve from behind, having, on a lateral side, a cam part configured to move a bolt contact part up and down, and having a locking projection extending downward from a bottom of the rear closed end and sloping upward from front to back; a bolt spring pushing the bolt forward; a sear located below the bolt, having a projection to come into contact with the locking projection of the bolt; a first trigger bar located turnably below the sear, having the bolt contact part extending upward at or around a front end to come into contact with the cam part of the bolt, and on a lateral side, a sear locking projection for locking the sear; an inner safety located forward of the sear, having a projection to come into contact with the locking projection of the bolt;; a second trigger bar located below the inner safety and forward of the first trigger bar slidably in the longitudinal direction, having on a lateral side an inner safety locking projection for locking the inner safety; a trigger bar spring configured to bias the second trigger bar backward; and said first trigger bar further comprises a contact part configured to touch as it moves the rear of the second trigger bar.