Abstract: A nozzle mechanism reducing displacement includes a main board, a pushing plate, a safety, a position limiting sleeve, an abutting member, and a cover. The main plate has two slide rails, with a nail feeding channel, slot, and nail pushing recess disposed therebetween. The pushing plate has concave slide grooves disposed on the bottom part to be slidably disposed in the nail pushing recess. The safety is fixed on the main board. The position limiting sleeve has a protrusion part on the top face and beneath the slot. The abutting member is mounted around the bottom face of the position limiting sleeve. The cover is on the main board. The combination of the position limiting sleeve and the main board effectively limits the nozzle inner diameter. In operation, deviation of the fired nail is reduced, so the nail is stably and accurately projected to the workpiece surface.