This tri-fold card (1) has a shape in which three cards (1a, 1b, 1c) can be unfolded in a contiguous side-by-side state. The tri-fold card is provided with tangent lines or boundary lines (2) between the card (1b), which is located in the middle of the three cards (1a, 1b, 1c), and the cards on the two ends (1a, 1c). The three cards (1a, 1b, 1c) are glued side-by-side to a plastic film mount (4). The tri-fold card (1) changes from an unfolded state to a tri-folded state by being folded and when folding, is folded into a stack with the tangent lines or boundary lines (2) as ridges. As appropriate or as needed, a pattern (5) or letters (6) are printed on one or both sides of the cards (1a, 1b, 1c).