The invention relates to a monitoring device for blood glucose values, comprising a blood glucose measuring unit (62) for measuring blood glucose measurement values and an image recording unit (58, 64) connected to the blood glucose measuring unit (62) for acquiring images. The invention further relates to a monitoring method for blood glucose values, comprising the following method steps: measuring (102) blood glucose measurement values acquiring (104) images and allocating (106) the images to the corresponding blood glucose measurement values.