Liquid viscosity measurement device and liquid viscosity measurement method

A liquid viscosity measurement device for measuring a viscosity of a liquid, the liquid viscosity measurement device comprising:

• a substrate;
• a channel configured to be installed on the substrate so that the liquid flows through the channel;
• a heating element configured to generate a bubble in the liquid inside the channel;
• a sensor configured to be placed in a vicinity of the heating element so as to measure a temperature;
• and
• a deriving unit configured to derive the viscosity of the liquid by specifying a bubble disappearance time period from generation to disappearance of the bubble based on a change in temperature obtained by use of the sensor, so that the viscosity of the liquid is derived based on the bubble disappearance time period,
• wherein the deriving unit is configured to specify the bubble disappearance time period based on a time at which the bubble is generated and a time at which an inflection point occurs in a drop phase which comes after the temperature measured by the sensor rises.