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A permanent magnet of an embodiment includes a sintered compact, the sintered compact including : a composition expressed by RpFeqMrCusCo100-p-q-r-s, (R is at least one element selected from rare earth elements, M is at least one element selected from Zr, Ti, and Hf, 10.5≦p≦12.5 atomic %, 24≦q≦40 atomic %, 0.88≦r≦4.5 atomic %, and 3.5≦s≦10.7 atomic %); and a structure having crystal grains each composed of a main phase including a Th2Zn17 crystal phase, and a crystal grain boundary of the crystal grains. An average crystal grain diameter of the crystal grains is 50 μm or more and 100 μm or less, and a ratio of the crystal grains having a crystal grain diameter of 50 μm or more is 75% or more.