Abstract: The portable terminal keyboard includes silicone rubber mixed with phosphorescent material used on the external exposed surface of the keyboard and conventional silicone rubber used for the moving parts, so that it is luminous for a certain duration by being irradiated for a while with a light source, thereby facilitating the user's entry operation and also enhancing the durability of the keyboard. The keyboard has its key mat made of a magnetic material so that it is attached by magnetism to the main frane, thereby faciliting replacement with a different key mat. The magnetic key mat structure allows the single access attachment and eliminates such conventional fixtures as lugs, whereby the key mat can be replaced more easily even in darkness and the lugs or the like are not present to be damaged as would be otherwise caused by frequent key mat replacement.