An image forming method comprising the step of transferring a toner image while applying vibration by ultrasonic wave where in the toner particle forming the toner image has a sea-island structure containing at least two islands of a releasing agent, and the average of the nearest distance between the islands is from approximately 100 nm to approximately 1060 nm and the number of the island having the nearest wall distance of not less than 1300 nm is not more than 10% of the whole number of the islands contained in the toner particle.