Liquid droplet ejection apparatus

A liquid droplet ejection apparatus comprising:

• an ejection head including a nozzle surface facing in a first direction, the nozzle surface including a nozzle configured to eject a liquid droplet;
• a light source including an emission surface facing in an optical axis direction crossing the first direction, the emission surface being configured to emit light toward a flying space in which the liquid droplet ejected from the nozzle flies;
• a light sensor including a light reception surface, the light reception surface being configured to detect an amount of light that is emitted from the light source and passes through the flying space;
• and
• a controller configured to perform an ejection malfunction detection of:
• detecting an amount of light by the light sensor when the liquid droplet is ejected from the ejection head and the light is emitted from the light source;
• and
• detecting an ejection malfunction of the nozzle based on the amount of light detected by the light sensor,
• the light reception surface being inclined to face in an inclination direction with respect to a state where the emission surface and the light reception surface face each other without inclination.