Create commerce product through web services
I've found the error. Firstable, my drupal commerce installation hasn't product_display content type. I have to add it manually. I don't know why, but It's missing after clean installation. Secondly, the right JSON structure for commerce price section is:  

"field_product":{ "und" :  
            {  "form": {
                   "commerce_price": {
                        "und": [ {
                           "amount": "1234.34",
                           "currency_code": "EUR",
                           "data": { "components": [] }
                            } ]
                      },
                   "sku":"eeaafe3231aa"
          }


After this change, I can create products display and I can see it on product manage page. Hope It could be useful for other who has the same problem.