A rotary operating-type electronic device used mainly in a peripheral apparatus such as a mouse for computers, portable telephones, an electronic device mounted on an automobile, and the like, in which a rotary type component and a linearly-driven type component are operated by a rotating manipulation of an operating knob attached to an operating axle and a tilting manipulation of the same knob in a direction orthogonal to an axis of the operating axle. The device is so constructed that the operating axle is supported to be rotatable together with a rotary encoder unit and also tiltable, by fitting an end of the operating axle in an axle-supporting portion having a non-circular center hole of a rotor of the rotary encoder. An operating knob of either a discal shape or a polygonal shape having a predetermined width is attached to an intermediate portion of the operating axle that protrudes from the rotor, and a push switch is disposed in a position to be in contact with another end of the operating axle.