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Italy started their World Cup Pool B campaign in changing weather conditions.
The took an early lead before the Azzurri drew level with a penalty try.
Italy took charge from Tommaso Allan along with Tito Tebaldi with attempts.
Matteo Minozzi, edoardo Padovani, Carlo Canna, Jake Polledri scored after the separation, while Chad Plato along with JC Greyling scored consolations for Namibia.
Italy initially struggled from the rain and had to wait till the 25th minute to take the lead, but since the sun emerged in the second halfof the Six Nations facet turned on the style as they overpowered their enemies, who at 23 are the lowest ranked side in the tournament.
Italy captain Sergio Parisse, 36, became only the third man to play in five World Cups, matching the totals of compatriot Mauro Bergamasco and Samoa’s Brian Lima, along with his 141st international cap also drew him level by former Ireland and British Lions captain Brian O’Driscoll in 2nd position on the one time list.
“The important thing was to win and accept the five things,” Parisse stated.
“Big congratulations to Namibia also because they never gave up. They kept playing into the finish.”
The only negative for the Azzurri was Tiziano Pasquiale was stretchered off until the break.
Play was temporarily stopped for what appeared to be a throat injury while the prop received medical care.
Italy are next in action against Canada on Thursday, 26 September (08:45 BST), whereas Namibia confront neighbors South Africa on Saturday, 28 September (10:45).
Defending champions New Zealand, who beat against South Africa on Saturday, would be another group from the group.
Italy: Hayward Benvenuti, Morisi, Padovani; Allan, Tebaldi; Quaglio, Bigi, Pasquali Ruzza Mbanda, Parisse.
Replacements: Fabiani Riccioni, Budd, Polledri, Palazzani, Canna, Minozzi.
Namibia: Tromp, Plato De la Harpe, Greyling; Stevens, Loubser; Van Jaarsveld, Rademeyer, Coetzee, Van Lill, Uanivi, Kitshoff Venter.
Replacements: De Klerk, Van der Westhuizen, Theron, Retief, Katjijeko, Walters Kisting.
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