To provide a novel dental treatment trapper for effisiently trapping and removing splash produced during dental treatment so as to prevent hindrance to the dental treatment.

A splash trapper comprises an air blow-off device 12 including a long air blow-off port 22 for blowing air having a width greater than the oral cavity part 46 of a patient 44 so as to form an air curtain 18, and an air sucking device 14 including a long suction port 34 for sucking the curtain- like air blown off from the air blow-off device 12, the air blow-off device 12 and the air sucking device 14 being arranged so as to be opposed to each other in a planarly arranged configuration including the oral cavity part 46 of a patient 44 facing upward. Splash scattering from the oral cavity of the patient 44 during dental treatment is trapped by the air curtain 18 created by the blow- off device 12, and is sucked into the sucking device 14.