Rear sheet adjustment assembly of neck collar

A rear sheet adjustment assembly of neck collar, including:

• a nape base, including a main body, at least one stopper, a positioning member and a plurality of openings, the at least one stopper being connected with the main body and defining a first distance and an inserting space therebetween, the positioning member and the at least one stopper being disposed oppositely on the main body, at least part of the positioning member being movable to a blocking position or a releasing position, a first combination portion of the positioning member being insertable into the inserting space when changing in position, each of the openings being configured for a band to be disposed therethrough;
• a support sheet, being configured to support a nape, being movably inserted within the inserting space, including a plurality of second combination portions, each of the second combination portions being adjustably engageable with the first combination portion;
• wherein the first combination portion is located at the inserting space and engaged with one of the second combination portions when the positioning member is in the blocking position;
• the first combination portion is departed from the second combination portions and moved away from the support sheet when the positioning member is in the releasing position.