The present invention provides a new transparent double-sided adhesive sheet which, when used in such a manner that a member which is a component of an image display device and in which the surface to be laminated has a difference in level is applied through the transparent double-sided adhesive sheet, can conform to the difference in level to completely fill the gap. Furthermore, the strain that arises inside the adhesive sheet can be mitigated, and the adhesive sheet can be made to retain non-foaming properties in high-temperature or high-humidity environments, without impairing the handleability. This adhesive sheet is a B-stage transparent double-sided adhesive sheet which is characterized firstly by comprising one or more (meth)acrylic ester (co)polymers, an ultraviolet polymerization initiator (A) which has a molar extinction coefficient, measured at a wavelength of 365 nm, of 10 or greater and a molar extinction coefficient, measured at a wavelength of 405 nm, of 0.1 or less, and a visible-light polymerization initiator (B) which has a molar extinction coefficient, measured at a wavelength of 405 nm, of 10 or greater, and is characterized secondly in that the value obtained by dividing the dynamic storage modulus (E') as measured by a tensile method at 60 DEG C by the dynamic storage modulus (G') as measured by a shear method at 60 DEG C, E'/G', is 10 or greater.