Patent ID: 7141977

Claim:
A magnet for an NMR analyzer, in which an electric conductor is wound around an axis as a magnetic axis, and by turning on the electric conductor, a magnetic field that includes a measurement space for conducting measurement is generated in the space which is surrounded by the electric conductor, and a probe for measuring an NMR signal is insertable into a first access port wherein said electric conductor is wound such that the magnet includes the first access port for receiving the probe and through which access from the outside of the magnet to said measurement space is possible via the vicinity of said magnet axis and a second access port for receiving a tube containing a sample to be measured and which enables access in a direction different from a direction of access of the first access port, and said electric conductor does not interfere with the area where the first and second access ports are located; and when the sizes of the first and second access ports are compared based on the definition that the effective diameter of the first and second access ports is the diameter of a cylinder which can be inserted into the access port, the effective diameter of the second access port is smaller than that of the first access port.