A mobile terminal, comprising: a terminal body; an ultrasonic sensing unit (143, 243, 343) mounted on at least one side surface of the terminal body and configured to generate an ultrasonic wave on a path propagating along the at least one side surface of the terminal body; and a detecting circuit configured to detect a touch applied to the terminal body by using a signal change caused due to a touch on the path of the ultrasonic wave, wherein the ultrasonic sensing unit (143, 243, 343) comprises: an ultrasonic output sensor (144, 244, 344) configured to output the ultrasonic wave; and an ultrasonic receiving sensor (145, 245, 345) spaced apart from the ultrasonic output sensor (144, 244, 344) and configured to receive the ultrasonic wave output from the ultrasonic output sensor (144, 244), characterized in that the mobile terminal further comprises: a force sensor (361, 471, 571) disposed adjacent to the ultrasonic output sensor (144, 244) or the ultrasonic receiving sensor (145, 245); and a controller configured to compensate a signal change of the ultrasonic receiving sensor (145, 245, 345) using touch sensing by the force sensor (361, 471, 571), wherein the ultrasonic sensing unit (143, 243, 343) has a sensing sensitivity compensated when a waveform of a signal received by the ultrasonic receiving sensor (145, 245, 345) satisfies a signal attenuation condition, wherein the ultrasonic output sensor (144, 244, 344) or the ultrasonic receiving sensor (145, 245, 345) is mounted on a flexible circuit board (246, 346, 446, 546), and wherein the flexible circuit board (246, 346, 446, 546) includes an actuator disposed thereon to cover the force sensor (361, 471, 571). a terminal body; an ultrasonic sensing unit (143, 243, 343) mounted on at least one side surface of the terminal body and configured to generate an ultrasonic wave on a path propagating along the at least one side surface of the terminal body; and a detecting circuit configured to detect a touch applied to the terminal body by using a signal change caused due to a touch on the path of the ultrasonic wave, wherein the ultrasonic sensing unit (143, 243, 343) comprises: an ultrasonic output sensor (144, 244, 344) configured to output the ultrasonic wave; and an ultrasonic receiving sensor (145, 245, 345) spaced apart from the ultrasonic output sensor (144, 244, 344) and configured to receive the ultrasonic wave output from the ultrasonic output sensor (144, 244), characterized in that the mobile terminal further comprises: a force sensor (361, 471, 571) disposed adjacent to the ultrasonic output sensor (144, 244) or the ultrasonic receiving sensor (145, 245); and a controller configured to compensate a signal change of the ultrasonic receiving sensor (145, 245, 345) using touch sensing by the force sensor (361, 471, 571), wherein the ultrasonic sensing unit (143, 243, 343) has a sensing sensitivity compensated when a waveform of a signal received by the ultrasonic receiving sensor (145, 245, 345) satisfies a signal attenuation condition, wherein the ultrasonic output sensor (144, 244, 344) or the ultrasonic receiving sensor (145, 245, 345) is mounted on a flexible circuit board (246, 346, 446, 546), and wherein the flexible circuit board (246, 346, 446, 546) includes an actuator disposed thereon to cover the force sensor (361, 471, 571). an ultrasonic output sensor (144, 244, 344) configured to output the ultrasonic wave; and an ultrasonic receiving sensor (145, 245, 345) spaced apart from the ultrasonic output sensor (144, 244, 344) and configured to receive the ultrasonic wave output from the ultrasonic output sensor (144, 244), characterized in that the mobile terminal further comprises: a force sensor (361, 471, 571) disposed adjacent to the ultrasonic output sensor (144, 244) or the ultrasonic receiving sensor (145, 245); and a controller configured to compensate a signal change of the ultrasonic receiving sensor (145, 245, 345) using touch sensing by the force sensor (361, 471, 571), wherein the ultrasonic sensing unit (143, 243, 343) has a sensing sensitivity compensated when a waveform of a signal received by the ultrasonic receiving sensor (145, 245, 345) satisfies a signal attenuation condition, wherein the ultrasonic output sensor (144, 244, 344) or the ultrasonic receiving sensor (145, 245, 345) is mounted on a flexible circuit board (246, 346, 446, 546), and wherein the flexible circuit board (246, 346, 446, 546) includes an actuator disposed thereon to cover the force sensor (361, 471, 571). a force sensor (361, 471, 571) disposed adjacent to the ultrasonic output sensor (144, 244) or the ultrasonic receiving sensor (145, 245); and a controller configured to compensate a signal change of the ultrasonic receiving sensor (145, 245, 345) using touch sensing by the force sensor (361, 471, 571), wherein the ultrasonic sensing unit (143, 243, 343) has a sensing sensitivity compensated when a waveform of a signal received by the ultrasonic receiving sensor (145, 245, 345) satisfies a signal attenuation condition, wherein the ultrasonic output sensor (144, 244, 344) or the ultrasonic receiving sensor (145, 245, 345) is mounted on a flexible circuit board (246, 346, 446, 546), and wherein the flexible circuit board (246, 346, 446, 546) includes an actuator disposed thereon to cover the force sensor (361, 471, 571).