Liquid chromatograph mass spectrometer

A liquid chromatograph mass spectrometer that is a combination of a liquid chromatograph and a mass spectrometer, the liquid chromatograph separating components in a sample, the mass spectrometer performing mass spectrometry on the components separated by the liquid chromatograph, the mass spectrometer comprising:

• a mass spectrometry section that performs the mass spectrometry;
• a casing that accommodates the mass spectrometry section;
• a valve device that is interposed in a flow path for the sample from the liquid chromatograph to the mass spectrometry section and is attached to the casing;
• and
• a pipe fitting to which a liquid discharge pipe that communicates with a liquid discharge section is connected, wherein
• the valve device includes:
• a hollow main body housing that is attached in the casing and has an opening section;
• a flow path switching mechanism that is accommodated in the main body housing and switches the flow path;
• a lid member that is detachably attached to the main body housing, includes a flow path connection section to which the flow path from the liquid chromatograph is connected, and closes the opening section of the main body housing;
• and
• a connection pipe that is attached to the lid member and connected to the pipe fitting to enable the sample leaked on the lid member from the flow path connection section to be discharged to the liquid discharge pipe, and
• the connection pipe is inserted in the pipe fitting in a state where the lid member is mounted to the main body housing.