Seat armrest

A seat armrest, comprising:

• a support unit, having a fixed seat and a support rod extending upward from the fixed seat;
• wherein the support rod has an accommodation space inside, and a wall surface of the support pole is provided with a positioning slot section composed of a vertical displacement slot and a plurality of horizontal displacement slots communicated with each other,
• a casing unit, sleeved around the support rod of the support unit, and having a hollow installation groove extending outward from a top of the casing unit;
• wherein the installation groove is communicated with the accommodation space of the support rod;
• an adjusting rod, accommodated and pivoted in the accommodation space of the support rod;
• wherein the adjusting rod has a positioning protrusion, and a top being pivoted inside the installation groove of the casing unit;
• and
• wherein the installation groove of the casing unit has a buttonhole and a first pivot portion on an inner wall;
• wherein the adjusting rod has a pivot rod and a connecting rod in a different axial direction on the top of the adjusting rod;
• wherein the connecting rod has a first fixing rod and a connecting rod respectively protruding from an upper side and a lower side of the connecting rod;
• wherein a button is disposed into a buttonhole of the installation groove of the casing unit and connected to the connecting rod of the adjusting rod;
• wherein the button has a connecting groove corresponding to the connecting portion of the connecting rod, and the connecting groove of the button is connected to the connecting portion of the connecting rod;
• wherein each of the horizontal displacement slots has an inclined section, the aperture of the inclined section gradually decreases toward the vertical displacement slot, so that the positioning protrusion can be firmly positioned in the horizontal displacement slot.