A terminal block includes a terminal block body, an engaging member, an elastic member, and a hook member. The terminal block body includes left and intermediate blocking portions. The engaging member is slidably provided on the terminal block body and includes a clawed operating portion, a connecting portion connected to the operating portion, and a stop block provided on the operating portion in order to be blocked by the left blocking portion. A blocking portion is formed where the connecting portion and the operating portion are connected. The elastic member is provided in the operating portion and pressed between the intermediate blocking portion and the blocking portion. The hook member includes an upper end movably connected to the connecting portion, a hooked lower end, and a pivotal connecting portion located therebetween and pivotally connected to the terminal block body. The terminal block is space-saving and features increased convenience of operation.