Abstract: A mobile terminal (10) of the present invention has a sensor (15) for detecting a pulse, in an upper end portion of a back surface of a main body of the mobile terminal (10). The sensor (15) is constituted by a light-emitting element and a light-receiving element. A position of the sensor is determined so that a force acting on the sensor falls within a range from 50 gf to 200 gf in a case where the mobile terminal is supported at its lower end portion and at the sensor by a fingertip. Thus, the present invention provides the mobile terminal (10) which can be always carried with a user and which realizes easy and stable pulse measurement.

Abstract: Provided is an authentication device and an authentication method of, even in the case of selecting correct images for authentication from among the displayed images to perform authentication, making hard to be read by others and improving security, and a program for causing a computer to execute the same. A main control portion 12 selects at random one or more correct images 23 to be displayed from a correct image DB 17 within the number of images to be displayable by a display portion 14 so as to be stored in a display correct image storage portion 19. Dummy images are selected only by the number of images that are displayable by the display portion 14 from a dummy image DB 18. The main control portion 12 lists and displays the selected display images on the display portion 14. The main control portion 12 changes a display number and display arrangement of correct images and dummy images so as to be differentiated from those in previous authentication.

Abstract: A mobile terminal (10) of the present invention has a sensor (15) for detecting a pulse, in an upper end portion of a back surface of a main body of the mobile terminal (10). The sensor (15) is constituted by a light-emitting element and a light-receiving element. A position of the sensor is determined so that a force acting on the sensor falls within a range from 50 gf to 200 gf in a case where the mobile terminal is supported at its lower end portion and at the sensor by a fingertip. Thus, the present invention provides the mobile terminal (10) which can be always carried with a user and which realizes easy and stable pulse measurement.