noun
share of expenses; contribution
Refers to a monetary amount that each person or party is responsible for paying as their portion of a shared cost.
旅行の分担金は一人一万円です。
The share of expenses for the trip is 10,000 yen per person.
クラス会の分担金を集めています
We are collecting contributions for the class reunion.
会費 is a membership fee or dues for an organization. 分担金 is broader and can refer to any shared cost, not necessarily tied to membership.
Compound of 分担 (ぶんたん, 'division of responsibility') and 金 (きん, 'money').