The present invention provides a grinding device, a grinding method, and a manufacturing method of a thin-plate like member. When an end surface of thin-plate glass is ground, grinding machining is performed through the data shot by a camera. High-precision machining can be performed and grinding machining can be performed without setting a mark on the surface of the thin-plate glass. In S4, a mechanical original point of a machining platform is calculated according to a position of a reference pin. In S5, a gravity center position of an outer figure of a practical workpiece and a gravity center position of a hole are calculated. In S6, the gravity center position of the practical workpiece (the gravity center position of the outer figure and the gravity center position of the hole) is consistent with a gravity center position of a model (the gravity center position of the outer figure and the gravity center position of the hole). In S7, the mechanical original point of the machining platform is compared with the gravity center position of the practical workpiece for calculating the derivation amounts (a transverse deviation amount X, a longitudinal deviation amount Y and a deviation amount theta in a rotation direction) to the mechanical original point. The practical workpiece is compared with the model, and the grinding amount is calculated according to a difference of the outer figure.