Tension measurement device

A tension measurement device comprising:

• a pair of rotatable first support rollers;
• a pressing portion arranged to face a midpoint between the pair of first support rollers;
• and
• a load cell capable of measuring a load applied to the pressing portion,
• the tension measurement device being capable of measuring a tension of a measurement target by clamping the measurement target between the pair of first support rollers and the pressing portion, wherein
• a pair of rotatable second support rollers is arranged to face the pair of first support rollers,
• the pressing portion protrudes, with respect to a phantom line connecting the pair of second support rollers to each other, toward the pair of first support rollers, and
• a positional relationship between the pressing portion and the pair of second support rollers is constant.