The present invention relates to a touch pen and a portable terminal device having the same, preventing wrong insertion of the touch pen into the portable terminal device and improving a grip feeling when the touch pen is gripped. The present invention provides the touch pen provided in the portable terminal device with: a pen point coming into contact with a touch screen provided in the portable terminal device; a wrong insertion preventing part extending in a longitudinal direction of the pen point and having an asymmetric cross section; and a pen holder extending from the wrong insertion preventing part having one flat surface in the extending direction. [Reference numerals] (AA) Up; (BB) Left; (CC) Right; (DD) Down
