To provide a head speed measuring device quickly transmitting the measurement data of the head speed to a lot of persons.

The measurement data of the head speed measured by a device body 30 is transmitted to a remote display device 50 using radio wave on wireless and the remote display device 50 displays the received measurement data on a large-scale display 52. By providing a plurality of remote display devices, this constitution allows a plurality of persons to easily recognize the measurement data at real time. If the large-scale display 52 is provided, many persons can easily recognize the measurement data at real time. No wiring cable is present between the device body 30 and the remote display device 50 so that the remote display device 50 can be installed at an arbitrary place.