Abstract: A liquid droplet jetting apparatus includes a liquid droplet jetting head which jets droplets of two types of liquids; a discharge mechanism which discharges the two types of liquids from the jetting head respectively; a waste liquid recovery device which recovers the two types of liquids discharged by the discharge mechanism, having a waste liquid case, an absorbing body accommodated in the waste liquid case, two liquid intake portions for letting the two types of liquids discharged by the discharge mechanism flow respectively into the waste liquid case, and a waste liquid detection section which detects whether only one or both of the two types of liquids has or have reached a detection position by measuring electric conductivity at the detection position away from the two liquid intake portions in the absorbing body; and a full liquid judging section which judges whether the absorbing body is fully permeated.