The permanent magnet

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To provide a permanent magnet having high magnetic coercive force while maintaining good residual magnetic flux density. An R-T-X based permanent magnet includes a main phase consisting of an RTX type compound (where, R is one or more kinds of rare earth elements including Y, T is one or more kinds of transition metal elements essentially containing Fe or Co, and X is one or more kinds of elements selected from Be, B, and C essentially containing Be), and the main phase has a tetragonal NdFeB type crystal structure 100.