To provide a data collection device capable of surely collecting information when a trigger condition is satisfied, while suppressing the amount of data received form a data collecting destination.

Under condition that a prior measurement condition is defined as a previous step of satisfying the trigger condition, a data collection device 1 monitors operation command information from an operation command device 3, as a result of the monitoring, when determining that the prior measurement condition is satisfied, commands a control apparatus 2 to buffer the sensor value for a motor 21 and, when determining that the trigger condition is satisfied, commands the control apparatus 2 to transmit the buffered sensor value. This constitution can surely collect sensor values when the trigger condition is satisfied, while suppressing the amount of data received from the control apparatus 2.