The inventive cassette (10a) for a medical instrument (28) comprises at least one tray (14a) and a cover (12a) where the tray (14a) includes a rigid basic structure (23a, 23b, 23c) and fixed thereon a holding means (24a) for holding the medical instrument (28). The holding means (24a) has a cutout (26a) for retaining the medical instrument (28) and is attached to the rigid basic structure (23a) in a gap-free manner by molding, welding or gluing.
