noun
main parts; main components
Refers to the primary or essential parts of a machine, system, or product.
この機械の主要部品はすべて国産です。
All the main parts of this machine are domestically produced.
主要部品の交換には専門知識が必要です。
Replacing the main components requires specialized knowledge.
Compound of 主要 (main, principal) and 部品 (parts, components).