A golf green measuring device according to the present invention includes a plurality of spaced apart rails attached to an enclosed structure. Accordingly, the front-rear-directional collision load is stably transmitted to a member, such as an adjacent engine, such that it is possible to efficiently improve the effect of distributing and reducing the load in a collision. The aim of the invention is to maintain a belt run which favors a pre-determined milling result, in an especially simple and reliable manner. The primary clock signal is de-activated when the clock system enters the power saving mode and is activated when the clock system exits the power saving mode. Thus, a pair of extension layers are formed in the surface of the silicon substrate.