The locally ordered structure for poly(ethylene terephthalate) in the glassy state, quenched from the melt, has been investigated by two-dimensional solid-state C-13 spin diffusion nuclear magnetic resonance spectroscopy. The orientational correlation is found to be successfully examined for different mixing times, which correspond to C-13 spin diffusion times, through the C-13 spin diffusion for carbonyl carbon C-13-labeled poly(ethylene terephthalate). For mixing times shorter than 0.8 s, the broadening of the diagonal peak occurs and its intensity decreases in the region from sigma(11) to sigma(22) with increasing mixing time. From a comparison with the simulated spectrum, it is suggested that such changes are due to the existence of the well ordered region even in the glassy state. For mixing times longer than 0.4 s, the intensities of the off-diagonal peaks are also found to increase with increasing mixing time. Detailed analyses of the off-diagonal peaks suggest that there is a stacked component for mixing times of around 1 s, in which the planes composed of the phenylene ring and two adjacent carbonyl groups are stacked with each other. The spectra for mixing times over 3.2 s, which reach the quasiequilibrium state, are in good accord with the spectrum simulated by assuming no long-range orientational correlation. From the calculation of the C-13 spin diffusion rate, the radius of the region having the orientational correlation is estimated to be 0.5-1.4 nm.