Je was op zoek naar: armrest (Engels - Japans)

armrest
肘掛け

yasunori leaned into the armrest and looked in bemusement at the breakfast laid before him.
保憲は脇息に身を預け、目前に出された朝餉に当惑の目を当てていた。

ever been on a plane and find yourself looking down at the armrest next to you, looking at the little plug where the ashtray used to go?
飛行機の中で 横の肘掛を見たら 灰皿の場所が プラグになってたら？