PROBLEM TO BE SOLVED: To provide an oxime ester initiator which has higher reactivity to long-wavelength light, and hardly causes liquid crystal contamination, and to provide a curable resin composition containing the oxime ester initiator, a sealing agent for a liquid crystal display element made from the curable resin composition, and a vertical conduction material and a liquid crystal display element which are manufactured by using the sealing agent for the liquid crystal display element.SOLUTION: An oxime ester initiator is a compound having an oxime ester structure.