Pretreatment device

A pretreatment device comprising:

• a platen;
• a guide configured to guide a conveyance of the platen from a set position at which a recorded medium is set on an upper surface of the platen;
• a spray configured to spray a pretreatment agent onto the recording medium set on the upper surface of the platen guided in a first direction by the guide;
• an input portion into which is input at least one of an application range of the pretreatment agent onto the recording medium and an application amount of the pretreatment agent;
• a processor;
• and
• a memory storing computer-readable instructions that, when executed by the processor, perform a process including:
• setting, on the basis of at least one of the application range and the application amount input into the input portion, at least one of a conveyance speed of the platen and a spray duty ratio that is a ratio of a spray time during a spray period of the pretreatment agent.