A multicolor image-forming material comprising: an image-receiving sheet
comprising a support and an image-receiving layer; and at least four
thermal transfer sheets each comprising a support, a light-to-heat
converting layer and an image-forming layer, and each having a different
color, wherein an image is formed by the method comprising the steps of:
superposing each one of the at least four thermal transfer sheets on the
image-receiving sheet to be in a state of the image-forming layer being in
contact with the image-receiving layer; and irradiating the thermal
transfer sheet with a laser beam to transfer an image in an area of the
image-forming layer subjected to irradiation onto the image-receiving
layer, and at least one layer selected from layers comprised in the
image-receiving sheet and the at least four thermal transfer sheets
comprises a fluorine-series surface active agent which is a homopolymer
comprising a polymerizable monomer represented by the formula (1) and
having a weight average molecular weight Mw of 3000 or more.
