Abstract: Provided is a headrest structure. The headrest structure includes an ergonomically shaped hole in the shape of a back of a human head formed in a soft-textured material of latex foam or memory foam, and an auxiliary tray and frame that can be assembled with the back of a chair to relieve a neck and a head from discomfort.

Abstract: Provided is an adjustable headrest installed at an upper portion of a seatback of a chair which a user's head contacts characterized in that an ergonomic head-shaped recess is provided such that the recess is adjusted to be appropriate to different head sizes, head shapes, and neck shapes of users to conveniently seat the neck and the head, allowing the user to rest and sleep on the chair. The adjustable headrest mounted on the chair includes an upper block having an upper recess concaved in the front thereof to seat the head, and a lower block disposed under the upper block and having a lower recess concaved in the front thereof to seat the neck. Here, the upper block and the lower block are movable relative to each other.

Abstract: This invention with improvements in external figure and structure based on new and different concept for pillow and chairs is intended to create practical convenience in daily life and to minimize the neck and shoulder pain created from usage of uncomfortable pillows in bed and inconvenient chair during long-distance travel. In an aspect of external figure, the invention adopts the concept of ‘ergonomic shape hole of head-insert’ which they never tried so far. As for the structure, this invention provides insert space hole on the body of applicable objects which ‘pillow/headrest’ (it has an ‘ergonomic shape hole of head-insert’) combines with, for easy process of assembly and separation between body and pillow/headrest. Additionally it is designed to maximize the portability and to accommodate the multiple usage by unifying the shape and size of ‘pillow/headrest.’ This invention promotes the convenience and practicality for everyday use of the pillow and chair.