The purpose of the present invention is to provide a technology for improving scanning performance. This optical scanning device is characterized by comprising: a scanning unit including an optical waveguide that guides incident light and emits the light from the output end thereof and an oscillation unit that generates oscillation to oscillate the output end; and a signal transmission unit that transmits a signal so as to cause the scanning unit to scan an object. The scanning unit includes a first bonding and oscillation damping part that bonds the end surface on the output end side of the oscillation unit to the optical waveguide with an elastic member.