Since the 2000s, the interest in quantifying covert attention using microsaccade data has considerably increased, with microsaccades attracting attention in various research fields. However, many aspects of microsaccade measurement remain unclear, and no standard analysis has been established. Although previous studies have reported that the direction and frequency of microsaccades are modulated by covert attention, consensus has not been reached. Thus, additional empirical studies on microsaccades must be conducted, and their evaluation should be performed using unified methods. Accordingly, we conducted an experiment with 20 young adults to investigate the influence of covert attention on microsaccade direction. For microsaccade detection, we employed an existing algorithm that identifies microsaccades during a 120 s fixation task. The direction of each detected microsaccade was calculated using the arctangent2 function from the two angular coordinates at the onset and offset of a microsaccade. Statistical analysis revealed no significant differences in the number of microsaccades by direction across the evaluated attention conditions. On the other hand, as microsaccades are typically regarded as binocularly coordinated eye movements, we initially assumed that their directions are consistent in both eyes. However, in our experiment, we observed microsaccades with inconsistent directions between the left and right eyes.