刑けい務む所しょ長ちょう

Meanings

1

The head of a prison; a formal title for the person in charge of a correctional facility.

刑けい務む官かん
刑務官 is a prison officer or guard, a subordinate position to the 刑務所長.
所しょ長ちょう
所長 is a general term for the head of any facility or institute; 刑務所長 specifies the head of a prison.

Compound of 刑務所 (prison) and 長 (head, chief).