Fatboy Izakaya Bangkok Review (2026): Gaysorn Amarin Sushi, Menu and Prices (7.5/10)

The short version: Fatboy is a trendy izakaya on the third floor of Gaysorn Amarin, and the food is good. The 14-piece chef’s nigiri set is an 8, the chutoro was my favorite in it, and the ikura is an 8.5. Everything came out fast. The catch is value: the portions are small and it’s pricey, at ฿3,755 ($114) for lunch on my own. For the same price or less, Yamazato and KiSara give you a better setting, better service and more food. 7.5 out of 10. It’s a good restaurant, but I wouldn’t go back.

I went for a late lunch on November 10, 2026, at about 3 pm, on my own, and paid for it myself.

Finding it

Fatboy is on the third floor of Gaysorn Amarin, on Ploenchit Road, and it’s a bit hard to find. Enter from Ploenchit and walk past the center of the mall. Take the lifts or escalators up to the third floor, then head back the way you came. You’ll come out into a kind of outdoor area; go inside and you’ll see the restaurant, right next to Renu.

The setting: 7.5 out of 10

It’s a cool setting, hip and trendy, with some outdoor areas, in a high-end, trendy mall. Inside there’s a long wood bar, pixel-art ceiling panels, globe lights and big windows. When I went at around 3 it was basically empty, with one other table, which is to be expected at that hour.

Two things hold it back. It’s a bit hard to find, and I got a mosquito bite inside the restaurant. I don’t know how it happened, but it’s a nuisance, and a bit of a shame, because I’d have liked to sit there longer. So it’s not really a place I’d linger.

Service: 7.5 out of 10

The staff are nice and pretty friendly, and everything came out fairly quickly. But I couldn’t always understand them, and sometimes they weren’t too attentive, even with only one other table in the room.

The food: 8 out of 10

The food is all very tasty, and it’s a trendier, more modern style, which is kind of nice. The main drawback is that the portions are very small.

Chef’s special, 14 nigiri: 8 out of 10. The pieces are all well made, with a little glaze and small toppings on each. There’s akami, chutoro, some white fish, scallop and uni, and they’re all an 8. My favorite was the chutoro: good, pretty fresh, and in that small, delicate style. One minor thing is the variety. It’s mostly tuna and white fish, and it would be nice to have a salmon or a few others mixed in. ฿2,450 ($74).

Ikura, 2 pieces: 8.5 out of 10. I ordered these because I was still hungry after the set, and they were actually really tasty. It’s a shame the pieces are so small and so expensive. ฿500 ($15).

Edamame with wasabi salt: 8 out of 10. Pretty tasty, and I liked it quite a lot. The portions are small, though; it only fills about half the plate, which is kind of funny. I had two. ฿120 ($3.60) each.

What it cost

฿3,755, about $114, for lunch for one: the nigiri set (฿2,450, $74), the ikura (฿500, $15) and two edamame (฿240, $7), plus a 10% service charge and VAT. Paid myself. The bill comes in a folder with a pixel-art sumo that says “time to burn your baht,” which is about right.

Value: 6.5 out of 10

It’s a nice place, but it’s quite expensive, especially for Bangkok. It’s the most expensive of the Japanese restaurants I’ve reviewed here, and the portions are just very small.

Vs. Yamazato and KiSara

The quality is similar to Yamazato at the Okura, and maybe a little better than KiSara at the Conrad. But both of those have a slightly better setting, because it’s a bit more unique and feels more authentic. The service is slightly better at each, and you get more food for the same price or less.

Who it’s for

Where Fatboy wins is if you want something a little trendier. It’s more of a date spot, and probably not a place to bring the family. It also works for a quick stop if you’re shopping at Gaysorn.

Verdict: 7.5 out of 10

There’s nothing really wrong with Fatboy. It’s a good restaurant, the food is good, and everything came out fast. The drawback is value: small portions at a high price, when Yamazato and KiSara give you more for the same or less. So I wouldn’t go back, and it just shows how competitive the Bangkok restaurant scene is.

Nearby: Salvia, the Italian at the Grand Hyatt, Paris Mikki at CentralWorld, and the Conrad and the JW Marriott if you’re staying close by. For hotels, see where to stay in Bangkok.

FAQ

Where is Fatboy Izakaya?

On the third floor of Gaysorn Amarin, on Ploenchit Road in Bangkok, next to Renu. Enter from Ploenchit, go up to the third floor, then head back toward the Ploenchit side.

What are Fatboy Izakaya’s hours?

It opens at 11:30 am and closes at midnight, or 1 am on Fridays and Saturdays. Some listings show a break from 2:30 to 4 pm, but it was open when I went at 3. To book, call +66 83 949 5646.

How much does Fatboy Izakaya cost?

The 14-piece chef’s special nigiri is ฿2,450 ($74), two pieces of ikura ฿500 ($15) and edamame ฿120 ($3.60), plus 10% service and VAT. My lunch for one came to ฿3,755 ($114).

What should I order at Fatboy?

The ikura and the chutoro were my favorites. Expect small portions.

Is Fatboy Izakaya worth it?

The food is good, but it’s pricey for small portions. For the same money or less, I’d go to Yamazato at the Okura or KiSara at the Conrad.