An auto injector with a housing for accommodation of a syringe with a needle, the syringe being movably positioned in the housing between a first position in which position the needle is accommodated inside the housing and a second position in which position the needle protrudes outside the housing, a driver positioned laterally in relation to the syringe and configured for applying a force to the syringe thereby moving the syringe from the first position to the second position, a first injection lock configured in a locked state for preventing the driver from moving the syringe from the first position to the second position, the first injection lock comprising a rotatable release shaft configured for rotation between a first angular position in which position the shaft prevents the driver from moving the syringe from the first position to the second position and a second angular position in which position the shaft does not prevent the driver from moving the syringe from the first position to the second position, and an injection trigger member configured for releasing the first injection lock to an unlocked state by user operation of the injection trigger member in which unlocked state the first injection lock does not prevent the driver from moving the syringe from the first position to the second position, characterized in that the auto injector comprises a movable member configured with a first ring positioned in such a way that the release shaft extends through the first ring, and wherein the release shaft has first tongues protruding from the release shaft and extending in parallel with the longitudinal axis of the release shaft with end edges abutting the first ring in one angular position of the release shaft thereby preventing the first ring from moving in the direction of the first tongues, wherein the first ring has through-going grooves in its inner circular circumferential surface abutting the release shaft positioned in such a way that the first tongues of the release shaft in another angular position of the release shaft fit respective through-going grooves in the inner circular circumferential surface of the first ring, the grooves being sized to accommodate the tongues thereby allowing the first ring to slide along the release shaft with the tongues sliding in the grooves so that the first ring can be displaced in the direction of the first tongues, wherein the injection trigger member is coupled to the rotatable release shaft and configured to turn the release shaft from the first angular position to the second angular position by user operation, and wherein the movable member comprises a first arm connected to the first ring for conveying a force from the driver to the syringe plunger end for moving the syringe from the first position to the second position. a syringe with a needle, the syringe being movably positioned in the housing between a first position in which position the needle is accommodated inside the housing and a second position in which position the needle protrudes outside the housing, a driver positioned laterally in relation to the syringe and configured for applying a force to the syringe thereby moving the syringe from the first position to the second position, a first injection lock configured in a locked state for preventing the driver from moving the syringe from the first position to the second position, the first injection lock comprising a rotatable release shaft configured for rotation between a first angular position in which position the shaft prevents the driver from moving the syringe from the first position to the second position and a second angular position in which position the shaft does not prevent the driver from moving the syringe from the first position to the second position, and an injection trigger member configured for releasing the first injection lock to an unlocked state by user operation of the injection trigger member in which unlocked state the first injection lock does not prevent the driver from moving the syringe from the first position to the second position, characterized in that the auto injector comprises a movable member configured with a first ring positioned in such a way that the release shaft extends through the first ring, and wherein the release shaft has first tongues protruding from the release shaft and extending in parallel with the longitudinal axis of the release shaft with end edges abutting the first ring in one angular position of the release shaft thereby preventing the first ring from moving in the direction of the first tongues, wherein the first ring has through-going grooves in its inner circular circumferential surface abutting the release shaft positioned in such a way that the first tongues of the release shaft in another angular position of the release shaft fit respective through-going grooves in the inner circular circumferential surface of the first ring, the grooves being sized to accommodate the tongues thereby allowing the first ring to slide along the release shaft with the tongues sliding in the grooves so that the first ring can be displaced in the direction of the first tongues, wherein the injection trigger member is coupled to the rotatable release shaft and configured to turn the release shaft from the first angular position to the second angular position by user operation, and wherein the movable member comprises a first arm connected to the first ring for conveying a force from the driver to the syringe plunger end for moving the syringe from the first position to the second position.