The present invention is a sample processing apparatus. The apparatus includes: a sample processing unit configured to process a sample; a display; a memory for storing an electronic manual for the sample processing apparatus; and a controller that is capable of showing a relevant part of the electronic manual on the display when a trouble has occurred in the sample processing unit, the relevant part of the electronic manual describing an operation procedure to deal with the trouble. The controller is capable of showing a first screen for displaying relevant information on sample processing on the display, and is capable of showing the relevant part of the electronic manual on the first screen when a trouble occurs. The controller is capable of showing a a manual display instruction unit on the first screen, the manual display instruction unit is used for instruction of displaying the electronic manual, and the electronic manual is displayed on the display even if no trouble is detected by a sample processing unit after a user operates the manual display instruction unit,. The present invention also provides a method of troubleshooting in the sample processing apparatus.