1. A sample information detection apparatus comprising: a reflection unit comprising a reflection mirror configured to reflect an image of a sample container configured to contain a sample; an image acquisition unit comprising an imaging unit configured to image an imaging range covering images reflected by the reflection mirror, the image acquisition unit being configured to acquire the image of the sample container that is reflected by the reflection mirror; and a sample information detection unit configured to detect information displayed on a side portion of the sample container based on the acquired image.