Wedding in Japan

I am going to Japan for a wedding between my niece and a japaneese boy. Will his parents be expecting a gift from me? Would a book with pictures from Sweden be apropriate in that case?

Will his parents be expecting a gift from me?
Never.

BTW, maybe you give money about 70,000yen in goShugi-bukuro at reception desk of wedding place when you arrive there.
"goShugi-bukuro" http://goo.gl/CsuRg
You might want to ask your niece or her parents in advance?

Astrid Råberg,

Well, I wouldn't at all say "never" about the parents.

Are you representing the family of the bride? If so, it would be a nice gesture to bring a long a small something from your country. I once attended a Japanese friend's wedding in England on behalf of her parents. I was the only person coming from Japan and I brought along some small dishware for the English bride groom's parents.

But if someone closer to your niece is attending the wedding, discuss with that person. I don't think you have to actually shower the Japanese parents with gifts from the whole family.

Would a book with pictures from Sweden be apropriate in that case?

As a gift, that would be a nice gesture :)

If you are invited to attend the banquet along with other Japanese guests, the custom of "go-shugi" (money gift) might apply. But I have no idea where the first poster came up with that amount, which I consider too much in any case...

As Uco-san rightly suggested, I would discuss the matter with any other family member attending from your country, and also possibly talk to your niece about what kind of wedding it will be as well.