noun
Used to refer to the speaker's own office or firm, often in formal or business contexts.
当事務所では、新しいスタッフを募集しております。
Our office is currently recruiting new staff.
お問い合わせは当事務所までご連絡ください。
Please direct inquiries to this office.
当社 means 'our company' and is more general for a business entity, while 当事務所 specifically refers to an office or firm.
Compound of 当 (this, our) + 事務所 (office).