The present invention provides a recording apparatus which configures the installing part of ink cartridge to flat and can easily install the ink cartridge, and the ink cartridge which is small and flat in size and can be easily installed. The body of recording apparatus is provided with a hollow needle (82), a cover (130) covering the hollow needle, and a sensor part (170) which is provided with a lever that can open the cover and a projected wall (120) at the side clamped by the axis in the extending direction of hollow needle, and is provided with ink residual amount at the other side. The ink cartridge is provided with an ink supplying opening (260) which is connected with the hollow needle, a first concave part (240) for accommodating the sensor part at the side of ink supplying opening (260), and a second concave part (236) for accommodating the projected wall (120) at the other side. An operating part (238) is installed in the first concave part (240). The operating part extends the light shielding component inserted into the sensor part (17) in installing the ink cartridge and is adjacent to the second concave part in installing the ink cartridge for operating the lever (150).