Portable terminal device

A portable terminal device, comprising:

• a first case;
• a second case that is slidable along one surface of the first case;
• a first touch sensor that accepts input to the surface;
• a projecting section that projects from the second case toward the surface;
• a detecting section that detects a position of the projecting section;
• and
• a control section that controls input by the first touch sensor on the basis of output from the detecting section, wherein
• the control section enables input by the first touch sensor when the second case is in a first position where the second case exposes a detection area of the first touch sensor to the outside, and disables input by the first touch sensor when the second case is out of the first position,
• the projecting section shifts in contact with the surface together with sliding of the second case, and
• the detecting section detects a position of contact of the projecting section with the surface and has a second touch sensor that accepts input by the projecting section to the surface.