In order to provide a mattress that has punched holes of the same number and the same area as conventional products, is easy to contract thanks to efficient application of shearing stress to the punched holes of the mattress without the need of corrugation forming, and will neither deteriorate in strength nor increase the number of processing steps compared to conventional products, as well as a bed device using the mattress, a mattress 10 has such a structure that the (core of) foot section 18 is formed with a plurality of linear shaped holes 28 that are penetrated at regular intervals in the thickness direction of the foot section with the orientation of the linear-shape inclined relative to the width direction of mattress 10, and the plurality of holes 28 are arranged in the mattress 10 in a staggered layout when viewed from top.
