light diffusion resistance, adhesion, a novel shape that it is possible to improve the properties such as oil-absorbing irregular resin particles, to provide its production method, and its use. Irregular resin particles have a recess and a convex portion formed in the recess, the surface of the projecting portion is substantially spherical. Method for producing a deformed resin particles, a from 77 to 99.99 parts by weight of branched alkyl methacrylates, polyfunctional monomer and 0.01 to 3 parts by weight, monofunctional non branched alkyl methacrylate (meth) acrylic acid ester 0 The first monomer mixture 100 parts by weight including the 20 parts by weight, the presence of the polymer from 0 to 100 parts by weight of a chain transfer agent from 0.1 to 0.9 parts by weight (meth) acrylic acid ester in by polymerizing includes a step of obtaining a resin particle, a monofunctional aliphatic monomer, and a polyfunctional monomer of 5-50% by weight relative to the amount of the monofunctional aliphatic monomers After the second monomer mixture was absorbed on the resin particles, and a step of polymerizing.光拡散性、密着性、吸油性等の特性を向上できる新規な形状の異形樹脂粒子、その製造方法、およびその用途を提供する。異形樹脂粒子は、凹部と、凹部内に形成された凸部とを有し、凸部の表面はほぼ球形である。異形樹脂粒子の製造方法は、分岐アルキルメタクリレート77~99.99重量部と、多官能性単量体0.01~3重量部と、分岐アルキルメタクリレート以外の単官能性(メタ)アクリル酸エステル0~20重量部とを含む第1の単量体混合物100重量部を、連鎖移動剤0.1~0.9重量部と(メタ)アクリル酸エステルの重合体0~100重量部との存在下で重合させて樹脂粒子を得る工程と、単官能性脂肪族単量体と、単官能性脂肪族単量体の使用量に対して5~50重量%の多官能性単量体とを含む第2の単量体混合物を樹脂粒子に吸収させた後、重合させる工程とを含んでいる。
