An object is to provide a terminal cover which can be easily attached to a cluster while securely holding the cluster and which can protect lead wires extending from the cluster, a sealed type electromotive compressor whose terminal is covered with the terminal cover, and a refrigerant cycle device whose refrigerant circuit is constituted of the sealed type-electromotive compressor. The terminal cover comprises: a storage section which is depressed so as to contain a cluster electrically connected to the terminal and whose terminal-side face opens; and a recessed portion which is formed in a side wall inner portion connected to an opening of the storage section and which is to engage with a protruding portion protruding from the cluster, and an opening edge of the storage section is provided with a cut which corresponds to a terminal-side position of the recessed portion.