Liquid analysis device and sensor unit

A liquid analysis device comprising:

• a plurality of sensor portions each configured to contact a liquid and output an analog signal corresponding to a predetermined measurement target item;
• a plurality of conversion portions each configured to convert the analog signal obtained by a respective one of the sensor portions into a digital signal;
• a device body to which each conversion portion is connected by a wire or wirelessly, the device body being configured to acquire each digital signal from the respective conversion portion;
• and
• a plurality of coupling mechanisms that couple and fix the conversion portions to each other by bringing a plurality of side surfaces of the conversion portions into contact with each other, wherein
• the sensor portions and the conversion portions are attachable to and detachable from each other,
• each sensor portion includes a connection plug that electrically connects to the respective conversion portion, and
• a metal shield is provided at a connection portion between the connection plug and a wire of at least one of the sensor portions.