Provided is an evaporated fuel treatment device. The evaporated fuel treatment device includes a main body case and a lid. The lid includes a target port, and is configured to be attached to the main body case on an attachment surface defined in advance in the main body case. The target port is configured to guide a gas in a direction intersecting a flow direction of the gas in a target adsorption chamber. The lid is configured to be rotated along a rotation direction prior to being attached to the main body case, to thereby (i) allow selection of one attachment angle from two or more attachment angles and (ii) be attached to the main body case.