Abstract: A portable terminal device includes: a display; a display holder configured to fix the display and including a first arm including a first engaging piece and a first pin hole, and a second arm including a second engaging piece, a second pin hole and a projection and arranged at a position opposing the first arm; a first case including a first engaging part configured to engage the first engaging piece thereby temporarily fixing the display holder, and a second engaging part configured to engage the second engaging piece thereby temporarily fixing the display holder; and a second case including positioning pins. The positioning pins formed in the second case are inserted into the first pin hole and the second pin hole of the display holder in a state where the display holder is temporarily fixed to the first case, whereby the display holder is fixed.