Translation guide
A trusted, indispensable assistant or second-in-command.
Referring to a person who is the most reliable and closest aide, often in a work, political, or organizational context.
Literally 'right arm'. The most direct and common equivalent for 'right-hand man'. Used for a trusted, capable assistant in business, politics, or other organizations. Gender-neutral in Japanese, though the English phrase includes 'man'.
彼は社長の右腕として活躍している。
He is active as the president's right-hand man.
彼女は部長の右腕だ。
She is the department head's right-hand man.
Literally 'belly/heart'. Refers to a trusted confidant or right-hand person, often implying deep personal loyalty and shared secrets. Common in political or historical contexts.
Literally 'one arm'. Similar to 右腕, but can imply an indispensable partner or the person one relies on most. Slightly less common than 右腕 for 'right-hand man'.
Phrase meaning 'to become someone's right-hand man'. Useful for describing the process of becoming indispensable.
彼は努力して社長の右腕となった。
He worked hard and became the president's right-hand man.
The English phrase 'right-hand man' is gendered, but the Japanese equivalents 右腕, 腹心, and 片腕 are gender-neutral and can refer to women as well. In Japanese, you can simply use the person's name or title without worrying about gender.
右腕 emphasizes the functional role of being the most capable assistant, while 腹心 emphasizes deep personal trust and confidentiality. In many business contexts, 右腕 is more common and natural.
首相は腹心の部下を側に置いた。
The prime minister kept his right-hand man close.
彼は私の片腕となって働いてくれた。
He worked as my right-hand man.