The invention relates to a rapid diagnosis device with a device housing, on which there is provided a push-in opening for a test strip. The test strip is evaluated inside the rapid diagnosis device. On the device housing there is formed a housing opening, which can be closed by a cover or flap element. The cover or flap element is assigned a locking body. The locking body is formed as a spring element which comprises a clip portion, which assumes a position locking the spring element when the test strip has been pushed into the push-in opening of the rapid diagnosis device.