To simply measure a distance on a map, a waistline or a neckline without always having to carry a ruler, a tape measure, or the like.

When a set key 23 is depressed and mode switching from an operation mode for executing menu selection or the like, according to the operation of a jog dial to an operation mode for measuring the length of an object to be measured by using a rotation dial part 24 in the jog dial is instructed, the rotation dial part 24 is rotated in a state where when the outer peripheral part of the rotation dial part 24 being brought into contact with the object to be measured, the outer peripheral part of the rotation dial part 24 travels on the object to be measured, and a portable telephone terminal 1 will find the traveling length and displays the measured length on a display of a display part 12.