What it means
おまけに means “on top of that” or “what’s more.” It adds another point that strengthens or extends the previous statement, usually in the same positive or negative direction. It commonly connects two complete clauses and often appears at the beginning of the added clause. The expression itself does not change for familiar and polite speech; the surrounding clause endings show the register.
Usage note
おまけに is more emphatic than a neutral additive such as “also” because the added information makes the overall situation noticeably better or worse. It is usually used when the two points share a clear evaluative direction, rather than simply listing unrelated facts.
How to use it
この町は家賃が安いです。おまけに、駅も近いです。
Rent in this town is low. On top of that, the station is close.
この町は家賃が安い。おまけに、駅も近い。
Rent in this town is low. On top of that, the station is close.
Example sentences
この宿は駅から近くて、おまけに朝食まで付いている。
This inn is close to the station, and on top of that, breakfast is included.
新しい図書館は静かで、おまけに夜九時まで開いている。
The new library is quiet, and on top of that, it is open until nine o'clock at night.
今回の研修は参加費が無料で、おまけに昼食