The , commonly known as the Proof Set in the United States, is a set of proof coins sold by the Japan Mint. These sets were first issued in 1987 (Shà Âwa 62) as "regular proof sets" consisting of denominations of 1, 5, 10, 50, 100, and 500 yen (666 yen total). In addition to "regular", those made since 1997 have also been referred to as "special", as these sets include a decorative case and in some instances a non-legal tender medal. Proof coinage is not intended for circulation as these are targeted towards collectors.
All of the case sets issued during the Reiwa era have been in dark blue. As the 500 yen coin was redesigned in 2021, two varieties of proof sets exist for that given year.
Sets colored in yellow include all 6 denominations of yen with a medal.