Nailing device adapted for nail units of different sizes

A nailing device adapted for nail units of different sizes, comprising:

• a main body;
• a magazine, disposed in the main body, the nail units being seated on the magazine;
• a nail pusher, slidably straddled on the magazine to push the nail units forward along a pushing direction, the nail pusher having a first side wall and a second side wall which are both vertical, each of the first side wall and the second side wall having a front face which is vertical and is perpendicular to the pushing direction, two slanted guiding portions being frontward and outward extended from the front faces of the two side walls respectively, the two slanted guiding portions divergedly extending toward two sides of the pushing direction, each slanted guiding portion having a distal end which is located in front of the front faces of the side walls, distance between the two distal ends being larger than distance between the two front faces of the side walls, the slanted guiding portions having two guiding surfaces facing each other to guide and position staples, so that centers of different staples of different sizes can locate at the same position.