PURPOSE: To provide a paper storing apparatus for a copier in which plural sizes of paper are used, which can store copied paper by sizes by providing contact members capable of advancing and retreating at positions suitable for receiving each size of paper.

CONSTITUTION: A storing apparatus 40 is adapted to store, for example, A2WA4 sizes of paper 5EW5G by sizes which has been discharged through paper discharge driving apparatus 1, 2 and a paper discharge plate 3 in a copier. The apparatus 40 includes a storing tray 41 having a right end portion 41A bent up erect in such a manner as to receive the paper 5E. The tray 41 is provided with openings 41B respectively mounted at each part of the bottom thereof for receiving the paper 5F, 5G. Contacting members 42, 43 having a pressing portion at the upper end thereof are disposed at each opening 41B in such a manner as to advance and retreat therethrough. Solenoids 46, 46A are operated in response to a paper selection signal so that the contacting members 42, 43 are projected out upward to receiver the required size of paper.