An exercise support device of the present invention includes a detecting section which detects motion data related to a motion status of a user performing an exercise and an swing-angle obtaining section which obtains an swing angle of the user and an information notifying section which notifies the user of exercise support information for guiding the swing angle to a suitable angle. When the user is in a specific motion state with an swing motion of a part which is an arm or a leg of the user, the swing-angle obtaining section successively tracks a swing status in one cycle of the swing motion in the specific motion state based on the motion data detected by the detecting section, and obtains a maximum value of differences between angles of the part of the user at two different timings in the one cycle as the swing angle.