A load applied to a lumbar spine is detected with a simple configuration. A load detection device for detecting a load applied to a lumbar vertebra, a detection unit for detecting a posture of a user, a relationship between a posture detected by the detection unit, a load applied to a user's hand, and a user's posture And an estimation unit for estimating a load allowed in the user's hand. In the load detection apparatus, the estimation unit may compare the load value input from the outside with the estimated load value. In the load detection device, the estimation unit may output an allowable range of the load applied to the user's hand based on the estimated load value. [Selection] Figure 2
