X-ray imagery of the solar corona with arcsecond-level angular resolution is a key to understand various activities of hot plasmas in the corona. We report our development activities of precision Wolter mirrors for future soft X-ray imaging observations of the Sun. The Wolter mirrors under development are fabricated by direct polishing of glass-ceramic substrates. We fabricated an engineering Wolter mirror of 3-m focal length whose mirror area was 40 mm x 50 mm (along optical-axis and cylindrical directions, respectively) for each of the parabola and hyperbola sections using EEM (Elastic Emission Machining) precision polishing technology. X-ray imaging performance of the mirror was then evaluated with 8-keV parallel X-rays at SPring-8/BL29XUL. For the mirror area whose tilt up to >6 degrees along the cylindrical direction, the mirror showed imaging performance of ~0.25 arcsec FWHM (~0.55 arcsec HPD) with the scattering level ~1 × 10-4 of the PSF peak at 30-arcsec off-axis position.
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