A static memory apparatus and a static memory cell thereof are provided. The static memory cell includes a data latch circuit, a data write-in circuit and a data read-out circuit. The data latch circuit has a first tristate output inverting circuit and a second tristate output inverting circuit. The data write-in circuit provides a first reference voltage to a power receiving terminal of a selected tristate output inverting circuit which is one of the first and second tristate output inverting circuits, and provides a second reference voltage to an input terminal of the selected tristate output inverting circuit during a data write-in time period. The data read-out circuit generates read-out data according to a voltage at an output terminal of the second tristate output inverting circuit and the second reference voltage during a data read-out time period.