The present invention relates to a crystal of bicalutamide having a defined form, as well as economical and industrially practical production methods of bicalutamide and a crystal thereof, which are superior in environmental benignity and safety.Accordingly, the present invention provides a production method of bicalutamide represented by the formula (I): ##STR00001## which includes at least a step of reacting a compound represented by the formula (3): ##STR00002## with an oxidizing agent, a production method of a crystal of bicalutamide, as well as a crystal form of bicalutamide as defined by X-ray diffraction (XRD) or solid .sup.13C NMR measurement.

 
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> Process for the purification of a crude carboxylic acid slurry

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