An NMR imaging device, comprising: a probe having space for housing a sample containing nuclear spins; a magnetic field generating portion configured to generate a static magnetic field and a gradient magnetic field in the space of the probe; a pulse application portion configured to apply after a π/2 excitation pulse a multiplexed π pulse, wherein said multiplexed π pulse consists of a plurality of π pulses with a predetermined π pulse interval 2τ, to the sample placed in the space in which the static magnetic field and the gradient magnetic field are generated as a generated magnetic field, wherein the nuclear spins of the sample are subject to a static noise and a dynamic noise; and an image processing portion configured to measure a nuclear magnetic resonance signal output from the sample after the multiplexed π pulse is applied for a sufficiently long period of time, such that below relationship is fulfilled, and configured to determine a transverse relaxation time (T 2 L) from an attenuation curve of the NMR signal which reflects the dynamic noise rather than the static noise, the image processing portion being configured to repeat the aforementioned steps, wherein the multiplexed π pulse is applied with a different Larmor frequency, such as to determine the transverse relaxation time (T 2 L) of the sample at a different position corresponding to the generated magnetic field, thereby performing imaging of the transverse relaxation time (T 2 L), the NMR signal and the transverse relaxation time (T 2 L) having a relationship shown in the following expression, W t ∼ exp − t / T 2 L W(t): NMR signal intensity T 2 L: signal attenuation constant (transverse relaxation time) t: time the predetermined π pulse interval 2τ and a frequency f of noise received by a nuclear spin in the sample from an external environment being expressed by the following expression, f = 1 4 τ f: frequency of noise received by nuclear spin τ: (a half of) π pulse interval. a probe having space for housing a sample containing nuclear spins; a magnetic field generating portion configured to generate a static magnetic field and a gradient magnetic field in the space of the probe; a pulse application portion configured to apply after a π/2 excitation pulse a multiplexed π pulse, wherein said multiplexed π pulse consists of a plurality of π pulses with a predetermined π pulse interval 2τ, to the sample placed in the space in which the static magnetic field and the gradient magnetic field are generated as a generated magnetic field, wherein the nuclear spins of the sample are subject to a static noise and a dynamic noise; and an image processing portion configured to measure a nuclear magnetic resonance signal output from the sample after the multiplexed π pulse is applied for a sufficiently long period of time, such that below relationship is fulfilled, and configured to determine a transverse relaxation time (T 2 L) from an attenuation curve of the NMR signal which reflects the dynamic noise rather than the static noise, the image processing portion being configured to repeat the aforementioned steps, wherein the multiplexed π pulse is applied with a different Larmor frequency, such as to determine the transverse relaxation time (T 2 L) of the sample at a different position corresponding to the generated magnetic field, thereby performing imaging of the transverse relaxation time (T 2 L), the NMR signal and the transverse relaxation time (T 2 L) having a relationship shown in the following expression, W t ∼ exp − t / T 2 L W(t): NMR signal intensity T 2 L: signal attenuation constant (transverse relaxation time) t: time W(t): NMR signal intensity T 2 L: signal attenuation constant (transverse relaxation time) t: time the predetermined π pulse interval 2τ and a frequency f of noise received by a nuclear spin in the sample from an external environment being expressed by the following expression, f = 1 4 τ f: frequency of noise received by nuclear spin τ: (a half of) π pulse interval. f: frequency of noise received by nuclear spin τ: (a half of) π pulse interval.