Provided is a toilet seat structure for an aircraft lavatory unit. A cushion block is formed of a single band-like body that has a band-like shape extending with a predetermined width along an entire circumference of a toilet seat in a circumferential direction. The band-like body has an elongated cross-sectional shape cut along with a plane orthogonal to the extension direction and includes: a flat upper surface; a flat lower surface; and inclined surfaces provided on both sides in the width direction. The band-like body has the upper surface that is attached to a lower surface of a body plate portion with an adhesive and inclined surfaces that form an obtuse angle with respect to the lower surface of the body plate portion.
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