Burger King Japan is bringing back its seasonal Mushroom Whopper lineup on September 18, 2026, with a ¥300 discount available on selected sets through the official app.
The Mushroom Whopper, Double Mushroom Whopper, and Mushroom Whopper Jr. will be sold at participating Burger King restaurants from September 18. The app coupon runs through October 1, while some locations and delivery orders are excluded.
The regular prices are ¥990 for the Mushroom Whopper, ¥1,440 for the Double Mushroom Whopper, and ¥590 for the Mushroom Whopper Jr. Sets cost ¥1,290, ¥1,740, and ¥890, respectively. During the coupon period, the Mushroom Whopper Set falls to ¥990 and the Double Mushroom Whopper Set to ¥1,440.
About the Mushroom Whopper
Mushroom Whopper
The Mushroom Whopper features a flame-grilled beef patty, four types of mushrooms, fresh vegetables, and creamy Premium Pepper Mayo Sauce. It costs ¥990 individually or ¥1,290 as a set.
Double Mushroom Whopper
The Double Mushroom Whopper adds a second flame-grilled beef patty to the mushroom-filled burger. It is ¥1,440 individually or ¥1,740 as a set.
Mushroom Whopper Jr.
The smaller Mushroom Whopper Jr. offers the seasonal mushroom flavor in a more compact size. It costs ¥590 individually or ¥890 as a set.
Mushroom Whopper Set Coupon
The official app reduces the Mushroom Whopper Set from ¥1,290 to ¥990, a ¥300 discount during the campaign period.
Double Mushroom Whopper Set Coupon
The Double Mushroom Whopper Set drops from ¥1,740 to ¥1,440 with the official app coupon, saving ¥300.
The seasonal burger combines a flame-grilled 100% beef patty with four types of mushrooms: two varieties of roasted mushrooms, king oyster mushrooms, and shimeji mushrooms. Lettuce, tomato, onion, and a creamy Premium Pepper Mayo Sauce complete the burger, with cracked black pepper and a touch of charred soy sauce adding extra savory depth.
Highlights
- The Mushroom Whopper is ¥990 individually or ¥1,290 as a set.
- The Double Mushroom Whopper uses two flame-grilled beef patties and costs ¥1,440 individually or ¥1,740 as a set.
- The smaller Mushroom Whopper Jr. is ¥590 individually or ¥890 as a set.
- The official app reduces the Mushroom Whopper Set from ¥1,290 to ¥990.
- The Double Mushroom Whopper Set drops from ¥1,740 to ¥1,440 with the app coupon.
- Each set includes small French fries and a medium drink.
Menu & Event Details
| Item | Details |
|---|---|
| Name | Burger King Mushroom Whopper seasonal menu and app coupon |
| Menu / items | Mushroom Whopper; Double Mushroom Whopper; Mushroom Whopper Jr.; Mushroom Whopper Set; Double Mushroom Whopper Set |
| Release date | September 18, 2026 |
| Period | Menu available from September 18, 2026; official app coupon valid September 18, 2026 – October 1, 2026 |
| Location | Participating Burger King restaurants in Japan |
| Stores | Not available at Burger King Tokyo Racecourse, Kyoto Racecourse, or Kansai International Airport Terminal 1 locations. The app campaign also excludes these three stores. |
| Price | Mushroom Whopper: ¥990 individually, ¥1,290 as a set; Double Mushroom Whopper: ¥1,440 individually, ¥1,740 as a set; Mushroom Whopper Jr.: ¥590 individually, ¥890 as a set; app prices: Mushroom Whopper Set ¥1,290 → ¥990, Double Mushroom Whopper Set ¥1,740 → ¥1,440. All prices include tax. |
| Official website | Burger King Japan |
Before you buy
- When can I buy the Mushroom Whopper?
- The menu launches on September 18, 2026. At restaurants with breakfast service, sales begin after 10:30 a.m., and selling hours may vary by location.
- How can I use the ¥300 discount?
- Download the official Burger King app and register as a member. The coupon is valid from September 18 through October 1, 2026, for up to three sets per transaction.
- Can I use the coupon for delivery?
- No. The coupon is available for dine-in and takeout orders, but not for delivery.
