Abstract: A tray-like open-top base member of the case closely receives the lower portion of a chain saw upon downward movement of the saw into case base member, and automatically and releasably connects to the chain saw by resilient detent elements. Upward movement of the chain saw relative to the case base member automatic effects release of the detent elements. Tools and other articles used for operation or maintenance of the chain saw are stored within open-top storage compartments in the bottom of the case base member. The articles are retained within the compartments by the overlying main body of the chain saw, when the chain saw and case base member are interconnected, and some of the articles are also retained in their compartments by additional detent elements. A scabbard is releasably retained upon the cutting chain assembly of the chain saw by ribs that engage the opposite sides of the assembly, and by a flange upon the inner end of the scabbard.