I think, by far, the best salad bar in Tokyo is the Sizzler in Setagaya on 246.
The restaurant is about 6 minutes walk from the west exit of Sakura Shnmachi station on the Denen-Toshi line about 12 minutes from Shibuya heading towards Kanagawa. The restaurant is open from 11 am until 11 pm seven days a week. Here is their webpage (sorry Japanese only!)
The salad bar there is fantastic. The place is extremely clean and kept quite nice. The food is always fresh (I've been there dozens and dozens of times).
The all you can eat lunch bar includes bread, soup, drink and dessert bar. Lunch all you can eat is ¥1980
Dinner all you can eat is ¥2380
It's the best salad bar deal I've ever seen in Tokyo. The food is good, I can relax, and the kids love the place. Everyone can find what they want at Sizzler in Setagaya.
Here, let me allow the photos to do the talking.
Outside view of building from 246 heading toward Shibuya. Beautiful newly reformed building. Parking for about 28 cars.
Quite spacious inside. This photo is about 1/4 of the entire restaurant so it seats a few hundred easily.
Large salad and fruits bar. Seriously, it's huge and the size of a salad bar you'd see in the United States.
About 21 different vegetables and organic tofu seen here.
12 different mixed salads here.... Seafood salad, Waldorf salad, others...
as well as apples, white and pink grapefruit sliced, bananas, orange slices, pineapple, peaches, as well as diced onions, shredded lettuce, olives, jalapenos, mixed cheese and salsa which is for...
...the burritos you can make. Taco meat and melted cheese for cheese nachos, gratin, spaghetti and curry rice are also available on the salad bar menu at no extra charge...
There is also soup bar that offers at least three types of soup daily
Of course, there are several styles of bread to choose from...
The drink bar offers everything you can think of....
And, of course, the kid's favorite, the dessert bar. Shoe-cream, coffee cake, chocolate mousse, apple strudel, three flavors of soft cream "ice cream" and chocolate and all sort of goodies that the kids like to sprinkle on top. Beware parents! The chocolate fountain pictured is only out on weekends and weeknights after 6 pm!
The address is:
Sakura Shinmachi 1 - 33 - 5
Tel: 03 - 3705 - 4919
Take the west exit from Sakura Shinmachi station. Turn left down Sazai-san street. When you get to the police box turn right and go up the hill. It's a one-way street. Follow the road up and turn to your left at the end. Sizzler will be on your left. Can't miss it.