An inner surface machining apparatus and an inner surface machining method for machining an inner circumferential surface of a cylinder portion of a workpiece having a cylinder bore formed therein, in which machining cost is reduced and machining quality and yield are improved. An inner peripheral surface processing apparatus 1 includes a grinding processing unit 10 for performing a grinding process for grinding an inner peripheral surface C0 of a cylinder section C with a grinding stone 11, and an inner peripheral surface of a cylinder section C with a plurality of honing stones 21. Honing processing unit 20 for honing processing for polishing C0, work conveying unit 30 for arranging cylinder section C at grinding processing position facing grinding wheel 11 and honing processing position facing grinding wheel holder 22, cylinder section C A control unit that performs inner peripheral surface processing control to perform honing processing on the inner peripheral surface C0 by arranging the cylinder portion C at the honing processing position after performing grinding processing on the inner peripheral surface C0 with the above-mentioned grinding processing position And 40. [Selected figure] Figure 1
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