Provided are a guide rail grinding device capable of grinding a guide rail more stably, a method for grinding the guide rail, and a method for adjusting the guide rail grinding device. The guide rail grinding device (1a) includes a grinding unit (4) and a traveling support (3a). The grinding unit (4) has a grinding means. The grinding means contacts the surface to be ground of the guide rail (2) and grinds. The traveling support (3a) has a first holding means and a guiding means. The first holding means holds the grinding unit (4) so as to maintain a relative positional relationship with the grinding unit (4). The guiding means guides the grinding unit (4) while contacting the guide rail (2) so that the grinding unit (4) moves in the first direction along the surface to be ground. In the traveling support (3a), the first holding means is provided at the front end portion in front of the guiding means in the first direction.
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