Photomultiplier tube

A photomultiplier tube, comprising:

• a photoelectric surface configured to emit photoelectrons in response to incident light;
• an electron multiplying unit including a plurality of dynodes configured to emit secondary electrons in response to incidence of the photoelectrons emitted from the photoelectric surface and to multiply the secondary electrons;
• an acceleration electrode disposed between the photoelectric surface and the electron multiplying unit and configured to accelerate the photoelectrons to be incident to the electron multiplying unit;
• and
• a tubular accommodation container accommodating the photoelectric surface, the acceleration electrode, and the electron multiplying unit,
• wherein when viewed from a tube diameter direction intersecting a tube axial direction of the accommodation container, the photoelectric surface, the acceleration electrode, and the electron multiplying unit are disposed so that other members are not interposed between a first end portion of the acceleration electrode on the photoelectric surface side in the tube axial direction and the photoelectric surface, and between a second end portion of the acceleration electrode on the electron multiplying unit side in the tube axial direction and the electron multiplying unit.