To stably collect warped cards in a stacker part even when a stored card is warped, in a card stacker device having a function of stacking cards to be collected.

A guide member 16 having a rotary shaft 161 is provided at the other end side of a conveyance path 14 in the thickness direction of a stored card between a card slot 12 in a collecting direction and a stacker part 11, the guide member 16 is pressed by an end part Re in a collection direction of the collected card Cr to rotate toward the stacker part 11 and guides the collected card Cr so as to direct the end part Re in the collection direction of the collected card Cr to a surface Sc of one end side in the thickness direction of the stored card as one surface in the endmost stored card Cs.