noun
massager; massaging device
Refers to electronic or mechanical devices used for massage, including handheld massagers, massage chairs, and vibrators. The term is broad and can include personal massagers.
肩こりがひどいので、マッサージ器を買った。
My stiff shoulders were so bad that I bought a massager.
このマッサージ器は振動が強くて気持ちいい。
This massager has strong vibrations and feels good.
マッサージ is the massage itself, while マッサージ器 is the device used to perform the massage.
Compound of マッサージ (massage) + 器 (device) or 機 (machine). The word マッサージ is borrowed from English 'massage'.