An oxime ester compound of specified structure. In particular, in a photopolymerizable composition comprising (a) black color material, (b) organic binder and (c) photopolymerization initiator, the oxime ester compound constitutes the component (c). The oxime ester compound can be used as a highly sensitive photopolymerization initiator. The photopolymerizable composition containing the oxime ester compound in the form of a thin film excels in sensitivity and resolving power while exhibiting high light shielding capability, so that it is capable of forming a resin black matrix (BM) of low cost but high quality. The color filter utilizing this resin BM excels in precision, flatness and durability, so that it is capable of enhancing the display quality of liquid crystal device. Moreover, the production process and color filter per se do not involve any hazardous substances, so that the danger to human body can be reduced and environmental safety can be enhanced. Application thereof can be made to usages in which no color material is used, such as photospacer and rib (liquid crystal divided-alignment protrusion).