A machining system comprising: a machining unit configured to machine an upper edge and a lower edge of a plate-like work held in a horizontal orientation; and a moving apparatus configured to move the machining unit, the machining unit comprising a rotating tool configured to rotate about an axis in a vertical direction and machine the work, an upper surface abutting member configured to be abutted against an upper surface of the work when machining the work by the rotating tool, an end face abutting member configured to be abutted against an end face of the work between the upper edge and the lower edge when machining the work by the rotating tool, and a vertical moving unit configured to change a position of the upper surface abutting member in the vertical direction with respect to the rotating tool, and the rotating tool comprising a machining portion main body , a first machining portion provided on a lower side of the machining portion main body and configured to machine the upper edge of the work, and a second machining portion provided on an upper side of the machining portion main body and configured to machine the lower edge of the work, characterized in that the upper surface abutting member is a member including a hole as an insertion portion into which the rotating tool is inserted, the upper surface abutting member includes an annular abutting portion surrounding the hole and abutted against the upper surface of the work, and the annular abutting portion projects downward from a lower surface of the upper surface abutting member and has a lower end formed to have a semicircular sectional shape. a machining unit configured to machine an upper edge and a lower edge of a plate-like work held in a horizontal orientation; and a moving apparatus configured to move the machining unit, the machining unit comprising a rotating tool configured to rotate about an axis in a vertical direction and machine the work, an upper surface abutting member configured to be abutted against an upper surface of the work when machining the work by the rotating tool, an end face abutting member configured to be abutted against an end face of the work between the upper edge and the lower edge when machining the work by the rotating tool, and a vertical moving unit configured to change a position of the upper surface abutting member in the vertical direction with respect to the rotating tool, and the rotating tool comprising a machining portion main body , a first machining portion provided on a lower side of the machining portion main body and configured to machine the upper edge of the work, and a second machining portion provided on an upper side of the machining portion main body and configured to machine the lower edge of the work, characterized in that the upper surface abutting member is a member including a hole as an insertion portion into which the rotating tool is inserted, the upper surface abutting member includes an annular abutting portion surrounding the hole and abutted against the upper surface of the work, and the annular abutting portion projects downward from a lower surface of the upper surface abutting member and has a lower end formed to have a semicircular sectional shape. <EOS>