private interests; personal interests
Refers to one's own benefit or profit, often contrasted with 公益 (public interest).
See also: 公益
Politicians should not prioritize private interests over public interest.
彼の行動は私益のためだけだった。
His actions were solely for personal gain.
公益 is the benefit or welfare of the general public, while 私益 is a private or individual benefit that may conflict with it.
Compound of 私 (private) and 益 (benefit).