Probe

A probe in which an optical member is fitted in a distal end of a tubular member that is insertable to a lumen, the probe being configured to irradiate a measurement object part in the lumen with light and to acquire measurement light radiated from the measurement object part, wherein the probe comprises:

• a holding section including a space having an internal diameter smaller than an internal diameter of the tubular member is provided at the distal end of the tubular member;
• a liquid ejection trench configured to connect the space and an outer periphery surface of the holding section is formed in the holding section;
• an excitation light fiber configured to irradiate the measurement object part with excitation light;
• a light receiving fiber configured to receive measurement light radiated from the measurement object part;
• and
• a lens provided as the optical member, the lens being provided in front of the excitation light fiber and the light receiving fiber in such a manner as to face a distal end side of the tubular member,
• wherein an axial end portion of at least one of the excitation light fiber and the light receiving fiber is disposed at a position corresponding to an opening part of the liquid ejection trench on the space side of the holding section.