To perform uniform grinding.

This cutting edge grinding device comprises: a cutting blade holding base 5 for holding a cutting blade 3; a first guide member 21 along a longitudinal direction of the cutting blade 3 held to the cutting blade holding base 5; a support base 23 movably supported by the first guide member 21; a second guide member 24 provided on the support base 23 such that the second guide member 24 and the first guide member 21 cross each other; a mount base 25 movably supported in the direction coming close to or separating from the cutting blade 3 by the second guide member 24; a grinder 27 having a grinding wheel 26 mounted on the mount base 25; a first adjusting mechanism for adjusting a crossing angle between the first guide member 21 and the second guide member 24 such that the second guide member 24 approximately corresponds to an inclined angle of a side blade of the cutting blade 3; and a second adjusting mechanism for adjusting an angle of a grinding surface of the grinding wheel 26 so as to approximately correspond to a working angle of the side blade.