To provide an image recording medium used for multi-coloring with high sensitivity and utilizing the heat mode recording method using laser.

A non-silver salt image recording medium is provided with a coloring layer containing an acid generating agent represented by a formula I generating an acid by the action of heat or acid and a compound generating the intermolecular reaction or the intermolecular reaction by the action of the aid and also generating changes on a 360-900 nm absorption zone, and a plurality of coloring layers are formed. In the formula I, W1 represents a residual radial of acid represented by W1OH, and P1 represents a substituent to be separated by the action of heat or acid.