✔ 最佳答案
That sounds like a really nice salary. I'm training to become a doctor and I'll only be earning that in 15~20 years or so.
5209 euros/650000 yen should be more than enough. You should be able to support a small family (wife + child) in Tokyo with that money, including paying your child's tuition at a private school.
Just don't expect to live the same way as you do in the west, with a detached, two-story house. I grew up in Taipei and Hong Kong. House prices in Hong Kong are similar to those in Tokyo; my father earned around 5000 euros a month and our family of three lived in a (rented) 50 square metre flat. However, my father's income was more than enough to pay for my tuition from primary school through university.
Addendum:
Assuming that Tokyo and Hong Kong property prices are similar, expect to pay around 150,000 yen per month to rent a 50 square metre flat. Budget 20,000 yen/month for transport (price of a month's commuter pass if you're commuting around 20~30km to work), 15000 yen for utilities, and 2000 yen/day = 60000 yen/month for food if you're living alone.
Subtracting rent, transport, utilities and food from your salary leaves you with 405,000 yen - maybe a little less than 300,000 yen after tax - to save or spend as you wish. That's a lot of money!!