PROBLEM TO BE SOLVED: To provide a simple production method for deformed particles.SOLUTION: There is provided the method for producing deformed particles, which comprises absorbing a polymerizable vinyl monomer in an aqueous emulsion into seed particles and polymerizing the absorbed polymerizable vinyl monomer to provide deformed particles, wherein the seed particles are derived from (meth)acrylic ester at least containing a 2-10C alkyl halide group in the ester portion and are resin particles having weight-average molecular weight (measured by GPC: gel permeation chromatography) of 150,000-1,000,000, and the polymerizable vinyl monomer contains 5-50 wt.% crosslinkable monomer based on the whole amount of polymerizable vinyl monomer.
