A dental laser radiation chip includes an optical fiber including a fiber center section having a core and a clad and also including a jacket for covering the fiber center section. The dental laser radiation chip radiates a laser light having a wavelength of around 3 μm. A tip section of the dental laser radiation chip has a shape of frustum tapering forward in an axial direction. The shape of frustum includes a tip face from which forward laser light is to be radiated forward in the axial direction and an inclining side face from which side laser light is to be radiated in a radial direction with respect to the axial direction. The tip face is mirror-surface-finished to have a surface roughness of 0.008 μm. The inclining side face is rough-surface-finished to have a surface roughness of 0.4 μm.