Abstract: In measuring dynamic viscoelasticity, a problem that a viscous fluid sample such as polymer melt index, thermosetting resin, adhesive, or paint cannot be measured for dynamic viscoelasticity can be solved. Disclosed is a sample container 1 used to measure dynamic viscoelasticity according to temperature changes occurring when heating or cooling a sample. The sample container 1 includes a lower-end-closed sample cup with an opening at an upper end, and an insertion jig 5 having a cross section smaller in area than the opening of the sample cup 2, being insertable into the sample cup 2 through the opening, and being capable of transferring vibration to a sample contained in the sample cup 2.