noun
kleptomania; kleptomaniac
A psychological condition characterized by a recurrent urge to steal, typically without economic motive. Can refer to the disorder itself or a person with the condition.
窃盗狂は精神疾患の一種とされている。
Kleptomania is considered a type of mental disorder.
彼は窃盗狂
He is a kleptomaniac and ends up stealing even things he doesn't need.
窃盗 is the general legal term for theft, whereas 窃盗狂 specifically denotes the pathological condition of kleptomania.
Compound of 窃盗 (theft) and 狂 (madness, mania), likely a calque from Western medical terminology.