noun
personal space
Refers to the physical or psychological space around a person that they consider their own; used in contexts of comfort, privacy, and social distance.
満員電車ではパーソナルスペースが保てない。
You can't maintain personal space on a crowded train.
彼はパーソナルスペースが広いので、近づきすぎると嫌がる。
He has a large personal space, so he dislikes it when people get too close.